The pcm-s from the impala and regal have the same pinout.
If you put the regal pcm in the impala than you can flash it from the car`s adld conector.
After vin change you can try vats relearn with the regal pcm and try to start the car /make sure you run it for 10-15 seconds only/.
if the test is sucssesful you will have to do the vats relearn again with the impala pcm.
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