I was just wondering this. First of all, it's rare that any musician has played more than one instrument in more than one band, but there are a few. So I was wondering how many musicians have been in multiple bands with Top-10 hits, and they played different instruments in each band?
I don't think you can count the obvious Paul McCartney since he played bass in both The Beatles and Wings. Tony MacAlpine has played both keyboards and guitar in bands but has never been in a band with a Top-10 hit. You can sort of count Phil Collins as both a vocalist (solo) and drummer (Genesis), but that's cheating somewhat (although I'm sure vocalists disagree).
I know this has been done by someone else, I just can't remember by whom.