i have a 139 FMB on my motorbike, problem is that i killed the piston today because of a bad guy playing with my carburetor when not looking the bike ( i know who, i will kill him )

But i need to go to work. So i have a question : Can i swap my cylinder head+cylinder+carburetor+piston from a FMI or FMH 124CC or is there a crankshaft lenght problem ? or any hidden problem ?

I would swap the motors but the FMI and FMH have broken gear sets because i am fat and ugly.