I don't see a problem. Those soldiers look fresh enough to be 1942 or 43. If it was a T-34/85 you would want them to be wearing a motley of uniforms, half summer, half winter, ushankas and pilotkas, and probably no helmets, as Red Army Soldiers usually disdained them, especially later in the war. More mustaches too, that was a late war trend. Also, I didn't see Shoulder boards, so yeah, 42-43, your probably safe.
I have this same kit, going to start it someday...