You can swap to a 1G turbo ECU but the would need it to be an EPROM so you can run DSM link to tune it with no turbo. The GS is factory DOHC and very similar to the DSM computers as they have the same ignition style and almost all of the same sensors.
The other issue is the ECUs don't just fry for no reason. Bad grounds or a bad sensor that caused something to go wrong or even a leaking cap are reasons for failure. I would really look into why it failed.
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