J1 had the 50mm L'42, J2 onwards had the 50mm L'60.
And to really do things right, we would need at least 3 different panzer III variants, although we could get by with 2.
Right wayPanzer III Ausf. E: 30mm armor, 37mm cannon
Panzer III Ausf. H: 60mm armor, 50mm L'42 cannon
Panzer III Ausf. L: 70mm armor, 50mm L'60 cannon
Wrongway (joke intended
)Panzer III Ausf. E: 30mm armor, 37mm cannon
Panzer III Ausf. J: 50mm L'42 and 50mm L'60 to represent both late-Early War and early-Mid War setups.
While the Panzer III ausf. H isn't the best representation of the midle of the development for the Panzer III, it would allow for more realistic odds in a scenario or snapshot, seeing as we have no BT7, T26, M3 Grant, Crusader, or other light armor for it to fight. It would have to be up against a mix of T-34's (can't be just T-34's, since they weren't what anyone would call abundant during Barbarossa and into early-mid 1942.) and M8's (they would be slaughtered).
However, we MIGHT be able to do a reasonable representation with a Panzer III Ausf. G against T-34's if we gave limited numbers of the Panzer IV F armed with the longer 75mm mixed in with the Panzer III's and the IV's with the short 75mm.