T-34, T34-85 and IS1 Look similar also, apart from the 85 mm gun
Compare it To Axis side Panzer IV J , Panther G , Tiger E which look stunning different from each other.
Fun fact, by the time they where in production, the King tigers had such bad quality metal plates, that they tended to shatter when a shell large enough impacted them , so if an IS-2 got a direct hit to a KT from the front, it might kill the crew inside without penetrating the plate, because of all the spalling fragments flying around on impact
Btw, in this video around 9:34 mark starts the answers why all Soviet tanks around 1942-1945 looked pretty much the same. 85mm was just a standart and that’s it. Game is just being historically correct with vehicles and equipment. Personally, that’s why i always preferred playing Axis, for me their weapons & vehicles are simply more interesting, except Tunisia and maybe Moscow campaign too.
According to the standard, it is easier to make tanks.
Therefore, economically, the Soviet Union won.
More good regular tanks - high chance win.
But yes germany tank some diverse.
Of course there was 120mm heavy tanks but that’s more of a powercreep variant in a game, then Axis will also ask for a tank with bigger gun. Honestly, isn’t IS-1 and Tiger equal in chances taking each other out? Maybe IS-1 is bit worse for infantry killing because it has no 2nd MG but that’s all.