I replaced my PCM in a Ford escape and got new keys made, it worked. Now that PCM Broke and i'm trying to put the original PCM back in car?

My PCM broke so i ordered a replacement PCM and Keys. I installed the replacement and it worked for a month and broke so I sent the replacemnet back. I had the original PCM repaired wile waiting foir the replacemnt to be shipped back to me. Now I can't get the original PCM to start. It is because i reprogrammed the keys to the replacement PCM. Or because I replaces the drivers in the original PCM it has to be reprogrammed or something?

You will need a car locksmith or a dealer to reprogram the original PCM.