No, it's not me who is using shots conceded as a barometer.
I'm using my own opinion which I've formed after watching all Barca and Bayern games this season (I get the feeling you haven't seen many Bayern games this season, can't be sure though)
I have watched them, and I don't think we necessarily give away considerably more chances, certainly not one that is clearly noticeable. Usually, when a team can't break your defensive organisation, they take pot shots from distance.
The number of pot shots from outside the 18 yard box will be a good indication and it wouldn't be vastly different I would imagine. Theirs might be slightly better due to us being slightly more adventurous, like maybe in a typical game they will limit their opposition to one more shot outside the 18 yard box instead of inside, that is hardly significant though.