T34/76 has a 34% chance to pen a OKW P4 from max range. 55% chance it will score a natural hit. So that means the chance of getting a penetrating hit from max range are about 19%. Not sure if you can really say it's bad RNG IMO.
Meanwhile the OKW P4 pens the T34/76 at 73% even on max range. Given they have the same accuracy and target size you will end up hitting + penetrating at around 40%. So yeah, at least in this scenario it wouldn't be bad RNG to lose.
the t34s also have double the rate of fire and health though, as well as the capacity to flank. its greater investment for sure but even despite that the 2 has the advantage over the 1 handily.