Wiring problem, car won't start.

[Takeoff]

This is the situation. The car failed smog and I found out the engine wiring harness was missing the egr valve plug. I got a harness off a friend and replaced the whole harness. I also replaced the ecu but ended up putting the old one back. The car won't start now that I replaced the wiring harness. I think the car may have been a sohc that was changed to dohc. What could be wrong????The ecu #'s are Old ecu28 A11-b44-g70New ecu30 A11-B46-G72What is the difference???

[Takeoff]

http://jimwolftechnology.com/wolfpdf/ECU-ID.PDFI found this and my old ecu is a 91/92/93 ecu from a ka24de The new one is from a 91 ecu from a ka24deWould this make any difference. I would think so. they are both for manual cars w/ dohc