they would sound differnt anyway as they mounted on 2 different individuals
if you barry the mics under clothes use +4 db shelved caps and if you use over , flat would be just fine
by the way , b-6 is 2 wire mic and b-3 is 3 wire , if you use lectro tx the b-3 could be wire in 2 differnt way so may be phase reversed to the b-6
if you work with lectro 400series you have phase reverse inside the menu and if you work with normal mixer it must have phase reverse on one of its channels , if not and you have phase isues use reverse polarity cable
All good information -- thanks guys. I'm going to buy 2 Countryman lav's in the next day or two and I am trying to decide whether to get one of each (B3 and B6) or both the same. Could save a little money but in the long run I would rather just get the best choice now and be done with it. I running G2's and although I would love to have Lectro's it's just not in the budget for a long while.