So Starks are going to marry a Targeryen princess and bring her to the North and they will sign a non aggression pact with Targeryen's.
Also I will probably skip Maegor the cruel's reign and start Dance of the Dragon or House of Dragon after this.Some of the things like Aemma(Rhaenyra mother) dying and Visery's marrying Allicent Hightower will be the same.
Some of the evebts will change,some won't change much.