if you mean the different course of action from the main universe, then:
Dark Mirror: Nidhiki joined Tuyet and killed Lhikan resulting in Tuyet becoming dictator and ruling the MU with an iron fist.
The Kingdom: Matoro hesitated a moment too long and couldn't revive Mata Nui, who died, which resulting in a mass migration to Mata Nui (the island) and Takanuva becoming Turaga after preventing to enter and defeating the Brotherhood of Makuta.