It never is. I'm annoyed at everyone around here saying Barrie = Trubalance. I comfortably wore an 8.5D in Indy boots, and trying to squeeze my foot into an 8.5D longwing felt like I was on some lotus foot binding deal.
I think the people saying they are the same have narrow feet, so they just don't notice the change in width/volume between the lasts.
That barrie=trubalance maxim is what I am following, too.
Another thing about this (and I'm not sure it has anything to do with this) is that these have a crepe sole. Does this make a difference?