I am not sure who designs the menus, but I have had very similar dishes on multiple RC ships, perhaps with a different garnish here or sauce there.
These menus are posted for the entire cruise if you are trying to plan for each night.
Don't forget you can order multiple starters/appetizers, entrees and desserts! Or order a smaller portion of something in addition to something else! It doesn't mean you have to eat ALL of it, or you can, but it does allow you to try things you may not have ever tried in a restaurant before.
Enjoy!