You can't program a used ECM to that car as far as I know, it is on GM's Global A architecture and will require a new ECM, not used. Then it needs to be programmed using GM's ACDelco TDS online subscription.
On GM Global A vehicles, used modules are worthless, and swapping modules can actually lock up more modules that will require replacement with new.
https://www.youtube.com/watch?v=IeB3T-UEJeE
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