I feel like being in the frostbite engine would allow an almost drag and drop into the newer game. Battlefield 1 and V shared a ton of assets and a few weapons because they are built in the same Engine.
Game Development is very rarely as simple as that I'm afraid. One thing I wish the industry did more of is going behind the scenes to help educate and inform what goes into making games. Kind of like how movies have done it to a certain extent. I think that's a healthy discussion to have, for the industry as a whole.