The stock PCM can be swapped back in, as long as you have the right equipment to do it.
What is the right equipment? I contacted one of the tuners for the ECM/TUNE and received the following in the email .
" The new ECU requires programming before it will be tunable, and you will not be able to switch back and forth between the ECUs unless they are being reprogrammed each time—only one ECU can be programmed to the vehicle at a time. You will, however, be able to flash back to your stock tune at any time once the new ECU is in the car."
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