Of course they won't work. New engine, different package set.
Modified engine. Could and probably a LOT of similarities.
Larian claimed it was more like Brand new - maybe slight exaggeration?
Well if it is brand new it is amazing how much it looks like a continuation. I think devs do this commonly enough, "we've made so many changes ITS LIKE a new engine". I'm not sure why they would do that and not just build on what they have. From what I hear it is a continuation as old tricks are still working with BG3.
