Board Thread:Questions and Answers/@comment-3048593-20140121063756/@comment-4651179-20140121072851

As far as I know the Bruin in Superior Spider-Man is supposed to be the same person who was Grizzly, as he mentions after being called Grizzly that he's trying to build a reputation (implying he was Grizzly but decided to change names). I swear I had changed his appearance to that of the identity of Grizzly, apparently someone didn't quite get the situation and thought it was a different character.

So, to make it short, they're different Bruins.