1985 380 se vs 83 380 sl vs 92 500 sl

[deportes]

Thinung about bying a 85 380 se parts car, is there any interchangeable parts with the 83 380 sl dual chain upgrade and a 92 500 sl ?

Is the tranny the same on all 3?
the engine is it the same on both 380's, what about the heads?
and ancilliary parts on the 380's. computer, idle controllers etc.