In many ways, Dishonored 2’s narrative setup is exactly the same way it was in the original Dishonored. There are only so many ways that someone can be dishonored. But after the titular inciting incident, the two games diverge in how they handle temporal morality: the way that characters (including the player) develop their sense of morals as the game progresses. The first Dishonored focuses on moving forwards into the future, whereas Dishonored 2 focuses on unraveling events that happened in the past. These two directions cause their stories to be different in subtle but important ways.
WARNING: Massive spoilers for both Dishonored 2 and Dishonored.