Bread-Bakers v097.n006.6

I've seen oat bran mentioned in a number of bread recipes, so I picked up a
small bag at the store this weekend.  When I got home, I realized I had "oat
bran flour blend". 

Can someone tell me what the difference is, or are they interchangeable?
 Thanks for your help.

Sharon (who's happy cause the sun finally brought some warmth to this frozen
tundra)