Are all 3 compressors in this package literally identical?

[oxinabox]

The names seem synomous to me,
and the code for each looks identical.
Am I missing something?

[bicycle1885]

Each compressor has a different range of thewindowbits parameter that is passed to zlib. Adding a magic number to the parameter or flipping the sign of it creates a different kind of compressor, but I think it is much clearer to allocate different names (types) to different compressors.