Sure! So the main difference is that the nullverse version is designed to sort of pipeline Isabelle over to the Foresters, so she leaves Alec younger and goes to the US instead of staying in England. In canon she doesn't leave until her early twenties on her own and goes to London; in nullverse she leaves at eighteen with Viola's help and goes to the Midwest, where Viola pays for her education. Nullverse canon also has a version of Alec who, while still English aristocracy, is not a crime lord, just to make the escape easier.