Berserker is from Armory Reloaded, World of Darkness 1e.
I feel it would be a shame if it did not.
No, they do not. From pg. 62 of Armory Reloaded:
Unless the text specifically notes otherwise, Fighting Style maneuvers don't stack. If multiple maneuvers provide the same benefit within the game system (a Defense bonus or dice bonus, for instance), your character only benefits from the best of the lot.
Aggressive Striking 2 - Iron Body grants one point of armor against bashing attacks. Berserker 2 - Adrenaline Rush grants one point of armor against bashing and lethal attacks. Having both would mean your character would get one point of armor against bashing and lethal attacks.