To elaborate on what ThomPhoenix said, Morrowind does not exist in the Planeshift world so any reference to it in the game would not be welcomed. You could possibly role play that events you experienced in that game were part of your character's back story but there are no vampires, the gods here are different, there are no demon lords trying to break through to conquer the realm so you are pretty much left with generic quest stories that could be translated into Planeshift terms. Also the races in the game here are the ones that are known and not any from the Elder Scrolls.