it is not a matter of performance difference between 76mm and the kwk 40.
the 75mm on the stug 4 and jagdpanzer 4 are basically identical to the kwk 40 used on the panzer 4. The only notable difference being that the panzer 4 used a 2.5X optics compared to the 5x/2.5x on the stug's and jagdpanzer4.
the 75mm on the stug 4 and jagdpanzer 4 are basically identical to the kwk 40 used on the panzer 4. The only notable difference being that the panzer 4 used a 2.5X optics compared to the 5x/2.5x on the stug's and jagdpanzer4.