Uh, all BBP axles have the same flange offset. So, for BBP axles you can use any BBP brake set up regardless of what was on there originally- 10x2.5", 11x2.5", 11x3", and 11x2". The backing plate offset is different for the different width brakes, so, you can't run an 11x2" backing plate with an 11x2.5" drum.
But you can use an 11x2" brake set up on any BBP axle, be it 8 3/4, D60, 8.25 or BBP 7.25.
You can't use any of the BBP brakes if you have SBP axles, because the axle flange offset is different (not just because the bolt pattern is different!)