Scent is suppose to be the same but nobody comments on it at the YC like they do at the BC. Remember, I stay out of the dark side as much as possible. Only time I'm over there is to walk a guest over when they look confused when I give them directions...figure it's easier to just walk them.
The deluxe rooms at the YC are entirely different as far as I remember. More like a suite. But I haven't been in one for ages. They have lots of pictures of them at
https://disneyworld.disney.go.com/resorts/yacht-club-resort/rates-rooms/ and as you can see the price of the YC deluxe CL room is much more than the price of the BC deluxe CL room (which is more like a super large regular room). The price of a deluxe CL room at the BC is cheaper than a CL water view room wherein the price of a deluxe CL room at the YC is much more than a CL water view room.