Hi Courtney!
Sounds like someone in your family really loves the Princesses!
You will probably see a few of the same Princesses at Cinderella's Royal Table, Princess Storybook and Cinderella's Happily Ever After Dinner, but they won't all be the same. I can't tell you for sure who will be at each of your meals because the do rotate which Princesses are there for greeting.
Cinderella's Happily Ever After Dinner is all characters from Cinderella like the Princess herself, Prince Charming and the Step-sisters and Step-Mother and the Fairy Godmother.
Princess Storybook Dining is usually hosted by Snow White, Belle, Jasmine and Sleeping Beauty. I've even heard of Ariel making an appearance.
Cinderella's Royal Table is always an initial meet and greet with Cinderella herself, with wandering characters such as Belle, Jasmine and Snow White. When I was there several years ago, we had a couple of Cinderella's mice greet our table.
I'm sure you will run into some of the same Princesses twice, but these Princess character meals are all uniquely different with a completely different atmosphere in each. You and your family will be charmed for sure.
Have a magical day!
Leslie