96 and a 99 lumina whats the difrence in the trans?

Ok i curently have a 96 police model lumina that i want to strip down for the drivetrain. i have a 99 lumina that has bad trans. Whats the difrence in the two trans? The junkyard gave my pops a printout for the 99 it says he can only use the trans out of a 98 or 99 model car. but i beleve they both have the 4t60e transmission Am i corect on this? is the only thing difrent the sensors on the transmission. or does it have difrent mounting?

Thanks for all your help and sorry my grammer sucks