Well, you roll the same dice for actions, but neither a PzIV nor Sherman have any specialist attributes that let them reassign dice The armour/strike stats are different. 75mm Sherman is 6/6 PzIV is 5 for F&G/ 6 for H-J and 7 for strike So not greatly different in performance

These seem very much the same as their stats in IABSM

I meant different from their stats in WAT