Nearly the same characters are at CRT and Akershus. Though there might be 1 or 2 different characters, maybe. I have heard the Fairy Godmother can be present at CRT but I must say I have never seen her at any of the tables in the lunches or dinners I've had there - I've seen her outside the castle taking pictures though.
Basically between the 2 of them, you will get to meet, Cinderella, Belle, Alice, Ariel, Aurora, Snow White, maybe Jasmine? I know I met Jasmine in the castle once.
Also, I rather enjoy seeing the different actresses play them - I just get a kick out of it, because everyone plays them differently and has a different personality of course.
I've had good experiences with the princesses at both locations. They might spend a little more time with you in Norway, as the Castle can get busy, but I never felt shortchanged. Sometimes, as I'm a solo traveler, they even joined me at my table! Ariel did that once and I was delighted.
I enjoy the Norwegion food, myself, so I always go for lunch or dinner, but I believe the breakfast is Americanized. The lunch and dinner at CRT can be...iffy, even so-so, but the breakfast there has been much improved from what I'm hearing. Not sure if they improved the rest of the meals there.