From what I've read it is the correct one for a Gen III w/manual trans.
There is a warning: This kit is designed to work with crate engine M-6007-M50C.
And another warning:
Will NOT work with 2018 F-150 Engines
Installation of this PCM in a 2018 Mustang GT will result in a no-start condition.
Fits manual transmission application only.
Does NOT have provisions for A/C and Cruise Control
https://lmr.com/item/M6017M50B/musta...-18-m-6017-50b
So I'm guessing a donor engine VS a Crate engine maybe a no-go item.
Prob best to call Ford Performance to clarify.