It's a weird thing to gauge. How did SEA, LAR, ATL and even at times ARZ play SF tougher or match up better than GB did? SF playing to the level of their competition? The other teams have D better suited to stop SF? SF was missing more key players when they played those teams?
All we know, no matter if GB is the 2nd or 16th best team in the NFC, is that they do not match up well with SF whether it be mentally, physically, or otherwise. I think it's good they'll face off again next year to give us another comparison after another off season. Hopefully it's not another WK01 "rematch of the NFCCG" as those games usually tell us very little.