Can't say anything for sure, but there is no doubt a grizz would defend it's food more aggressively than a black in most circumstances.
However, I have never had a bear "roar" at me on my baits (black or grizz)....they will sit and watch or tree themselves, or if they get aggressive they'll start popping their jaw, stomping and possibly even bluff (never been bluffed by a black yet, but have been by a grizz). Seems weird you would hear a roar, my guess is most likely it wasn't related to you being there at all, you just happened to hear it.
Regardless, be extra cautious with grizz in the area man!
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