Hmmh, although #OpenMPT or pt2-clone usually do a really good with #Amiga #Protracker mods, it seems Mortimer Twangs "I'm the passenger" sounds different on OpenMPT/pt2-clone and #UADE123 output...

Thought first it's the sinc filter (which does some funky things as well) or stereo panning (to prevent stereo aliasing effects) option but it's maybe some effect handling that differs to the emulated m68k player.