Play both game and love them, especially combined, but this comparison is not worth anything. Totally agree with wombles last post.
If one spread out a coy in treanches over a 1km x 1km map and the opposing player, with FOW use one 105 (4 guns) barrage on this map to try and do as much damage as possible, one would come closer to the casualtie count in PzC. Its a totaly different thing if you have good knowledge of where the enemy is and can zero in the barrage.