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ECU hardware difference

PostPosted: Fri Apr 11, 2014 3:41 am
by Powermax

Car MY02 Subaru impreza WRX sedan manual

The car came with a AF731 ecu P/N 22611AF731. Installed in cars from 2001/0501 - 2001/0731 (3 months) Hot weather version of AF531

I have a second ECU AH570 P/N 22611AH570. Installed in cars from 2001/0401 - 2002/1031 (18 months)

1. Do these parts have the same hardware internally.
2. It is possible to flash the AF531 rom file to the AH570. Will the AH570 ecu work with a different rom file.

3. What are differences between these two ecus.

I found this further info

AH570 A4SE900I
AF731 A4SE900D

What does the last letter (I, D) denote? Does this mean only different software+tables?