I never played Divinity.

But I played Coop with some friends over the internet and it was pretty easy. Only thing is good communication (verbal) with other people to sort of level set what ya'll going to do because if you happen to play with someone who's just dead set on being an agent of chaos... then you might not have a great time since they can at any point directly affect the world. You may want to do a pure hero/villain run but the other people might have other ideas. Plan ahead, don't rush, and communicate.

The biggest thing, is scheduling with the other people. My friends it might be once a week for maybe 2 hours.... which means we're looking at least 2 years on a coop, lol.