Nah, get an ECU for RB20DET (standard), manual I presume?
Quick google search:
http://homepages.vodafone.co.nz/~lakewood/Skyline/ECU%20Identification.txt
Quick bing search:
http://webbersrbguide.com/index.php?option=com_content&view=article&id=58:rb-ecu-part-numbers&catid=45:wiring-electrical-a-ecu&Itemid=23
Do you guys have Japanese spares wreckers? If not, maybe import one from Yahoo Auctions Japan (via a third party shipper, in Aus we have Jesse Streeter and Import Monster to name a couple).