I have an Accord with a JDM H22A out of a 97 Accord SiR and I'm just curious if I could change the ECU and use an ECU from a 97 Accord Euro R since it is essentially the same engine

 

What is your current setup, Year, Model of car and what year model ECU?

From what I have read using a stock Euro R ECU is a lot easier said than done. If you need to stay OBD2 it would probably be cheaper to see if you can find a 96 P13 ECU. They are not the easiest to find, but they are the only OBD2 H22 ECU that doesn't have an immobilizer.

Other than that it would be converting to a tuneable OBD1 ECU and getting it chipped & tuned.

 

As long as it plugs then it might start. Might have to cross some wires up.

 

The car is a 1996 Accord LX and the engine, tranny, and ECU is from a 1997 Accord SiR. Also, the car is already converted to obd 1. It's pretty much stock other than a Megan Racing exhaust system and CAI.