[BigDuke66]

I recently checked a different game for the penetration power of the 2cm guns and found that it was rated rather high, there the German 2cm is rated with 3 while the 3,7cm has 4.
I thought I check here too and the usual value here is 4 for the 2cm while the 3,7cm has 5.

The penetration performance one can find on the web for the 2cm is about half(and less on higher ranges) of that of the 3,7cm, so one would expect a value of maybe 2-3 here in SP while about 2 in the other game, but both games rate the German 2cm much higher.
The question is, what is so special about the German 2cm that I obviously miss?