Sword of Spirit
Legend
For the big Adventure books, changing them to work with the 3E Campaign Setting is pretty trivial.
I'm afraid it hasn't really looked that way to me. Waterdeep has a whole new district in the north, the political structure has been shaken up--and that's just what I know without actually reading Dragon Heist. Dungeon of the Mad Mage is probably easier to work with though. Out of the Abyss is the one I have, which I think is probably one of the least affected, and I'm still at a loss as to how to account for all 200 years worth of changes to Blingdenstone in something like 2 years. Yes, it's trivial to change the names of the dwarven rulers and such that are minor players, and hopefully the same is true of the drow (haven't gotten past Blingdenstone in my read-through yet), but I'm not terribly optimistic. I'd bet Storm King's Thunder is a bit of a challenge, along with Tomb of Annihilation. Princes of the Apocalypse is likely somewhere in the middle. I could be wrong on some of those, but that's the impression I'm getting.
I'd be happy to know that I'm wrong and Blingdenstone is an outlier and they de-emphasized the stuff in SCAG if I am mistaken.