Can any of the ECM's between 1991 and 1995 for the 2.4 auto work in my 91 2.4 auto? Was there any major programming changes?

I'm looking at a 93 Eprom ecm MD185189 to replace my current MD163056 that is from 1993.

I do know the MD185189 is coming from California.. would there be different California emission programming in it that might not work with my Canadian truck?