They both use the same, STY opens in Win & Mac.
The RealTrack/Drum WAV are saved as AIFF and M4A for the Mac.
Mac will work with WAV RealTrack/Drum but Win won't work with AIFF so I can use the Win Audiophile on both Win & Mac.
The only thing Mac don't get is RealBand and a few features that Biab Win has like piano roll, conductor etc..