If you manage to lob in a 75 inside the turret, yes, congrats , you have won the ww2 lottery, and probably died seconds after, because of the angle you need to get that one into the hatch opening.
You must also remember if shell explodes without delay on the exterior of a tank, it can not penetrate much armor at all, and normal angle of attack from a 200mph b25h can't be that high if you don't want to plant the bird at the distance you need to have a chance of hitting that tank at all.
Well in real life tanks fought open hatch. If a 75mm HE explodes on the turret roof or inside the turret, the majority of the crew is dead.