swapping a 91 motor into a 90

[GSX-MAN-IN-TX]

I just wanted to know if there is anything differance of the two.
both are 6-bolts, AWD, 1G engs, 5-speed.
I want to swap the 91 eng into the 90 model

any wiring or ecu issues

 

[Agent Ezzard]

There are subtle differences in the CAS ,the power transistor, and perhaps other things I don't know about. But don't quote me on that. But there is NOT anything that is going to be an "issue". Just swap and drive away. Anyone else got anything?