ADD is a bit different in that "impulse control" usually refers to actions, while ADD refers to thoughts.

Someone with ADD lacks some control over the direction of their thoughts, but not necessarily actions. The two are similar, of course.

Jumping from a vehicle or throwing a punch is a failure of impulse control, because the person usually regrets doing it at all, almost immediately. ADD doesn't usually lead to regretted actions, but regretted balance of how time spent, how long is spent on an activity.