No, the VATS relearn is something you can do yourself.
key on, crank (no start), wait 10 minutes (600 seconds) (not a second less) with key on run, shut key off, replete 2 more times. the 4th crank try it will start (if it was a VATS issue.)

I'm not entirely convinced this is your issue though since you say the starter isn't cranking. Generally VATS issues give a crank and start then immediately die.

Try it though, because your VATS will have to be relinked since you swapped PCMs. It is something you will have to do anyway.