Thanks a lot merlins that really helps sounds like my top do list just got a hole lot more interesting. I'll be using my 00 ecu, does that mean I also need to swap my ignition cylinder?
No problem.
I never tried starting the car with the original ignition cylinder or an unchipped key so I don't know if you will need to. I have heard of people doing swaps between the chipped and unchipped years and having starting problems resulting from the immobilizer.
My swap was a crashed 00 LS going into a 99 GS-R shell. Rather than chopping up the harnesses to make the LS ecu fit I pulled the dashboard and swapped the harness among other things.
The shell had one mess of an aftermarket alarm installed so I switched the ignition cylinder while putting the dash back together instead of dealing with the horrible mass of wires the ignition had become.
Overall I ended up swapping the engine and trans, 75% of the interior, oem optional sideskirts, rear bumper cover and lights (car had 94-97 rear end), hatch (wingless), hood, front struts and camber kit, entire rear suspension, exhaust, and the brakes.
So basically the entire drivetrain, chassis and most of the interior.