Is it possible to use my OBD1 ecu off of my dead b18c on an obd2 b18c?

I have a guy selling an OBD2 b18c only 45min from me. Its a good deal, but I want to stay OBD1.

Is there more to making a motor obd1 than just the ecu?

What kind of problems am I going to run into?

Thanks guys