They are different species with different protected statuses. The grizzly bear (Ursus arctos horribilis) is classified as a Threatened Species under Federal law. With the exceptions of subsistence hunts by indigenous hunters in Alaska, you cannot obtain brown bear meat for consumption. However, black bears (Ursus americanus) have an increasing population across their range and are listed as of "Least Concern" for conservation status. Black bear hunting & meat consumption is regulated by US state-level Wildlife agencies. If obtained by under legal hunting regulations, anyone can eat black bear.