The Allison Mustangs are never included because the most famous version of the Mustangs had bubble canopies and Merlin engines.
Same reason you don't see the P-38 in many of these games. Sure, they built more of it than any other Western fighter, but it wasn't as famous.
About the naming, in my opinion thats a pointless technicality that changes nothing. The aircraft is the same one whether they call it a P-51B or whatever else it is you want it to be called. (you didn't make that clear, to be honest)
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