They won't do it. They will keep it consistent so that when a player grabs a Bf109F-4 they know what they are getting.
The Spitfire Mk XVI in AH is actually a Spitfire LF.Mk IXe, but because we already have a Spitfire F.Mk IX that is called a Spitfire Mk IX the new, 1944 version was labeled as the Mk XVI, which was almost, but not the quite, identical. The Mk XVI had a FTH about 1000ft higher than the LF.Mk IX.
You might be able to convince HTC to add a Bf109F-6 or such, if it existed, but you won't get two Bf109F-4s.