I lol'ed. German Arty has superior Range and Fire Rate. So no problem for it to counter Sovjet arty.
Vet for vet German arty has a shorter range than the Soviet artillery, this is true in all cases (mortars, mobile arty, stationary arty). The Ost arty has a superior fire rate, and more shots on target but a shorter range. However, on small maps this does not matter.
Having said that I find that more shots on target is less important than damage per hit. Since units that come under arty rapidly reposition it is critical to get as much damage per shot in as possible since only the first two shots really do damage (I find).
I tend to pair up other arty (mortars and trucks) for the same reason.