diff --git a/lib/compat/wordpress-6.3/theme-previews.php b/lib/compat/wordpress-6.3/theme-previews.php
index d5334b319ff8a..eab05c5824b1f 100644
--- a/lib/compat/wordpress-6.3/theme-previews.php
+++ b/lib/compat/wordpress-6.3/theme-previews.php
@@ -17,7 +17,7 @@ function gutenberg_get_theme_preview_path( $current_stylesheet = null ) {
 		return $current_stylesheet;
 	}
 
-	$preview_stylesheet = ! empty( $_GET['gutenberg_theme_preview'] ) ? $_GET['gutenberg_theme_preview'] : null;
+	$preview_stylesheet = ! empty( $_GET['wp_theme_preview'] ) ? $_GET['wp_theme_preview'] : null;
 	$wp_theme           = wp_get_theme( $preview_stylesheet );
 	if ( ! is_wp_error( $wp_theme->errors() ) ) {
 		if ( current_filter() === 'template' ) {
@@ -45,7 +45,7 @@ function gutenberg_attach_theme_preview_middleware() {
 		'wp-api-fetch',
 		sprintf(
 			'wp.apiFetch.use( wp.apiFetch.createThemePreviewMiddleware( %s ) );',
-			wp_json_encode( sanitize_text_field( $_GET['gutenberg_theme_preview'] ) )
+			wp_json_encode( sanitize_text_field( $_GET['wp_theme_preview'] ) )
 		),
 		'after'
 	);
@@ -88,7 +88,7 @@ function addLivePreviewButton() {
 			livePreviewButton.setAttribute('class', 'button button-primary');
 			livePreviewButton.setAttribute(
 				'href',
-				`/wp-admin/site-editor.php?gutenberg_theme_preview=${themePath}&return=themes.php`
+				`/wp-admin/site-editor.php?wp_theme_preview=${themePath}&return=themes.php`
 			);
 			livePreviewButton.innerHTML = '<?php echo esc_html_e( 'Live Preview' ); ?>';
 			themeInfo.querySelector('.theme-actions').appendChild(livePreviewButton);
@@ -115,12 +115,13 @@ function block_theme_activate_nonce() {
 /**
  * Attaches filters to enable theme previews in the Site Editor.
  */
-if ( ! empty( $_GET['gutenberg_theme_preview'] ) ) {
+if ( ! empty( $_GET['wp_theme_preview'] ) && ! function_exists( 'wp_get_theme_preview_path' ) ) {
 	add_filter( 'stylesheet', 'gutenberg_get_theme_preview_path' );
 	add_filter( 'template', 'gutenberg_get_theme_preview_path' );
 	add_filter( 'init', 'gutenberg_attach_theme_preview_middleware' );
 }
 
-add_action( 'admin_head', 'block_theme_activate_nonce' );
-add_action( 'admin_print_footer_scripts', 'add_live_preview_button', 11 );
-
+if ( ! function_exists( 'wp_get_theme_preview_path' ) ) {
+	add_action( 'admin_head', 'block_theme_activate_nonce' );
+	add_action( 'admin_print_footer_scripts', 'add_live_preview_button', 11 );
+}
diff --git a/packages/api-fetch/src/middlewares/theme-preview.js b/packages/api-fetch/src/middlewares/theme-preview.js
index c8f4c0b7aeaf1..8ab21fc328476 100644
--- a/packages/api-fetch/src/middlewares/theme-preview.js
+++ b/packages/api-fetch/src/middlewares/theme-preview.js
@@ -4,7 +4,7 @@
 import { addQueryArgs, hasQueryArg } from '@wordpress/url';
 
 /**
- * This appends a `gutenberg_theme_preview` parameter to the REST API request URL if
+ * This appends a `wp_theme_preview` parameter to the REST API request URL if
  * the admin URL contains a `theme` GET parameter.
  *
  * @param {Record<string, any>} themePath
@@ -13,19 +13,19 @@ import { addQueryArgs, hasQueryArg } from '@wordpress/url';
 const createThemePreviewMiddleware = ( themePath ) => ( options, next ) => {
 	if (
 		typeof options.url === 'string' &&
-		! hasQueryArg( options.url, 'gutenberg_theme_preview' )
+		! hasQueryArg( options.url, 'wp_theme_preview' )
 	) {
 		options.url = addQueryArgs( options.url, {
-			gutenberg_theme_preview: themePath,
+			wp_theme_preview: themePath,
 		} );
 	}
 
 	if (
 		typeof options.path === 'string' &&
-		! hasQueryArg( options.path, 'gutenberg_theme_preview' )
+		! hasQueryArg( options.path, 'wp_theme_preview' )
 	) {
 		options.path = addQueryArgs( options.path, {
-			gutenberg_theme_preview: themePath,
+			wp_theme_preview: themePath,
 		} );
 	}
 
diff --git a/packages/edit-site/src/components/routes/link.js b/packages/edit-site/src/components/routes/link.js
index 1f386ef0bb3dc..3191e6b9c6f3a 100644
--- a/packages/edit-site/src/components/routes/link.js
+++ b/packages/edit-site/src/components/routes/link.js
@@ -37,7 +37,7 @@ export function useLink( params = {}, state, shouldReplace = false ) {
 	if ( isPreviewingTheme() ) {
 		params = {
 			...params,
-			gutenberg_theme_preview: currentlyPreviewingTheme(),
+			wp_theme_preview: currentlyPreviewingTheme(),
 		};
 	}
 
diff --git a/packages/edit-site/src/components/sidebar-navigation-screen-navigation-menus/leaf-more-menu.js b/packages/edit-site/src/components/sidebar-navigation-screen-navigation-menus/leaf-more-menu.js
index c2fbc4ea480ef..d714ecb43b15d 100644
--- a/packages/edit-site/src/components/sidebar-navigation-screen-navigation-menus/leaf-more-menu.js
+++ b/packages/edit-site/src/components/sidebar-navigation-screen-navigation-menus/leaf-more-menu.js
@@ -67,7 +67,7 @@ export default function LeafMoreMenu( props ) {
 					postType: attributes.type,
 					postId: attributes.id,
 					...( isPreviewingTheme() && {
-						gutenberg_theme_preview: currentlyPreviewingTheme(),
+						wp_theme_preview: currentlyPreviewingTheme(),
 					} ),
 				} );
 			}
@@ -76,7 +76,7 @@ export default function LeafMoreMenu( props ) {
 					postType: 'page',
 					postId: attributes.id,
 					...( isPreviewingTheme() && {
-						gutenberg_theme_preview: currentlyPreviewingTheme(),
+						wp_theme_preview: currentlyPreviewingTheme(),
 					} ),
 				} );
 			}
diff --git a/packages/edit-site/src/utils/is-previewing-theme.js b/packages/edit-site/src/utils/is-previewing-theme.js
index 4ce57bfdbc508..1a71c441f9925 100644
--- a/packages/edit-site/src/utils/is-previewing-theme.js
+++ b/packages/edit-site/src/utils/is-previewing-theme.js
@@ -5,14 +5,13 @@ import { getQueryArg } from '@wordpress/url';
 
 export function isPreviewingTheme() {
 	return (
-		getQueryArg( window.location.href, 'gutenberg_theme_preview' ) !==
-		undefined
+		getQueryArg( window.location.href, 'wp_theme_preview' ) !== undefined
 	);
 }
 
 export function currentlyPreviewingTheme() {
 	if ( isPreviewingTheme() ) {
-		return getQueryArg( window.location.href, 'gutenberg_theme_preview' );
+		return getQueryArg( window.location.href, 'wp_theme_preview' );
 	}
 	return null;
 }
diff --git a/packages/edit-site/src/utils/use-activate-theme.js b/packages/edit-site/src/utils/use-activate-theme.js
index 966705a7722e4..64654318274cd 100644
--- a/packages/edit-site/src/utils/use-activate-theme.js
+++ b/packages/edit-site/src/utils/use-activate-theme.js
@@ -31,7 +31,7 @@ export function useActivateTheme() {
 				'&_wpnonce=' +
 				window.BLOCK_THEME_ACTIVATE_NONCE;
 			await window.fetch( activationURL );
-			const { gutenberg_theme_preview: themePreview, ...params } =
+			const { wp_theme_preview: themePreview, ...params } =
 				location.params;
 			history.replace( params );
 		}