For what I've seen, the changes brought by this mod are focused on things like the focus trees/advisors/generals, while the industry/research/equipment trees are exactly the same as in vanilla HOI4.

So, I was wondering if, because of this, this mod it wouldn't crash the game when combined with mods that do exactly the opposite, that is: keep focus trees/advisors/generals from vanilla and only change the industry/research/equipment part, like the ultimate/extended timeline and naval rework mods.

Out of curiosity, I tested a playset with these mods activated together, and the game started normally, and there were no apparent bugs. But I didn't press play, so I don't know if the game could crash later on.