There are some other differences between the two, but I don't recall what they are right now. I do recall several years ago fighting PRI issues with a BCM, and eventually found that the CO provisioned it as NI1, not NI2. They would drop calls, get busys inbound, d-channel would bounce like a rubber ball and all sorts of other strange things happened. It wasn't until the CO tech said the pipe was provisioned as NI-1 that we got the issue resolved. This was back in the release 2.5 days. If they can't do NI2, you'd be better off trying DMS100 custom, or something the BCM explicitly supports.