ECU for Celica ZZT-230 Question

Is it possible to swap a Celica ECU that is OBD2 compliant, with one that is not compliant? (IOW Pull the old one out and plug the new one in)
The reason I ask is that in New Zealand, where I live, all Celicas are
Quote:
NOT
compliant with OBD2.
OBD2 compliance for cars, was not made compulsory until 2006, unlike in the US where this came into being in 1996.
If straight swapping is possible I would like to import an ECU from the US. ->> Any offers??
The car is a Y2K model imported from Japan in 2004, ZZT-230 Engine 1ZZ-FE.
To date I have tried a number of scanners and not one of them can connect to the ECU, to for engine fault codes.
Hope some one can help here.