Yes, the P-51B is nearly identical to the C (other than build location) and the K is nearly identical to the D (Other than prop and build location).
Here is my point, there are currently only 15 skins for each plane. P-51 are some of the most documented planes of WWII, currently the skin waiting list for the 51B is about 6-8mo and the 51D is a year plus. No modeling change would have to be made to either, it just allows the skinners to add a couple more 51 skins to AH.
Just my little thought...