So I dunno if I would like this
It's a bit of a no-brainer, because it's a better game than Civ6, but it's not a particularly high bar to pass.
While you deserve a bit of flak for admitting to liking Civ6, the actual question is whether OW will be good fix for a Civilization fan fan.
Personally, I think it's a bit of a different animal, because of the added inter-character relations, so you should expect a different game, but with a bunch of familiar trappings.
It's a bit like playing CIV, but you're perpetually stuck in the first one or two eras with added layers of complexity.
Plenty of the stuff can be toggled on and off, so you can probably diddle with the settings to achieve something you're comfortable with.
It's even possible to turn off the CK-ish stuff off entirely. Now, I've yet to play CK3, but in comparison to CK2, Old World feels like a simplified version of it, so if you're looking for a gateway into CK, it might be feasible.