FR are different then PR. FR basically is a standard fighter version adapted with a camera. Most low back XIVs were delivered as FRXIVs. The PR19 was basically the Photo Recon version of the XIV being unarmed and carrying more fuel. The PRXI was the Photo Recce version of the IX, again with no guns, more fuel etc.
We have a few skins that are of FR Spits. The Pink Spit IX is a FRIX. There is a pink Mk I that's a gunned FR I essentially.
I'm not sure if we have any skinned but the P51B/C and D/K were also modified to carry cameras and redesignated F6. Again a fighter version with cameras. The P38 on the other hand was an unarmed version so it wouldn't work to skin those on a gunned 38.