it must shoot magical unicorn shit if it has better performance then. (or proper fucking APDS shells)
because the gun barrel length is the same, meaning shell velocity is the same.
more over the Ausf B is wargamging going derptastic and "lets give the L7 to a german tank!"
but then, the M68 on the patton is excactly the same gun (slightly different breech design) and i am honestly expecting massive performance differences between them.