There already are different versions of Pz3's but for some reason this one slipped so far off that it wasnt a big concern at the later stages of development. It is only temporary, devs know about it and they will most likely replace it in the future. Dont worry, be happy!
Remember, all those panzer3 versions you saw in FH (if you played FH) will be available for FH2 aswell as they were to support both mods.
