Yep me too, I am not sure what part are identical.
But I think
rear grab rail
I think I would get more joy from knowing what wasn't exchangeable!!
for example 500 heads on a 650?? will it fit
650 turbo on a 500?? will it fit
rear shock?? I know the euro fits cos I've done it(1" shorter)
Food for thouught
The seat is different, the brake calipers (Different sized pistons) are different, front turn signals (650 has awhite stripe) are different, side covers are different(ABS vs fiberglass), exhaust is different, coils are different...