Haha! So I bought an M100v4 and forced it to sound like the M80v3 (but with a v4 cross-over per Ian). There is a small difference between the M80's and 100's - and that obviously is in the bottom-end at larger output levels.

I think the metal tweeters too sound like the ones with plastic flashing - except at higher volume levels. So, turn up the volume to hear the differences :-)