How do you get that impression?
Ostheer has the f2 and the okw has the J version.
From the time the game is set, the Ausf. G makes the most sense. Panthers on the field means Ostheer is set post the battle of Kursk.
Further there was no Ausf. F2 with skirts, while the H was pretty much the G + Skirts. Also the gun always stays the same (was the same on G,H,J. The F2 had a slightly shorter gun).
Thinking of it: Didn´t they just replace the Ostheer P4 with the Ausf. J also? In that case it still has 80mm hull armor.