Depends on the restaurant. Some have the same menu all day (e.g. Via Napoli) while others have a different menus for lunch and dinner (e.g. Chefs).
Sites with menus that you can check:
http://allears.net/dining/
http://www.wdwinfo.com/wdwinfo/dining/diningmain.cfm
Below is the lunch menu for the CP package for Chefs de France.
Chefs de France Candlelight Lunch (5:00PM Show)
Prices: $$$ ($30 to $59.99 per adult)
New Prices Effective 11/28/2014 Adult: $63.89, Child: $17.03
Payment Methods Accepted: Travelers Checks, Key to the World, Cash, Visa, Disney Dollars, American Express, Disney Rewards Card, Master Card, Diners Club Card, Gift Card, Disney's Visa Credit Card, Discover, JCB, Disney Gift Card, KTTW Package Entitlements, Dreams Reward Card
Price Includes Tax but not Gratuity
For an extra special treat, ring in the holiday season with a Candlelight Dining Package, which includes reserved dining at a select Epcot® restaurant and reserved general seating at The America Gardens Theatre during the Candlelight Processional.
November 28th through December 30th, 2014
Lunch/ Dinner Packages include:
Appetizer, entree, dessert, non-alcoholic beverage (OR one (1) full buffet where applicable)
Appetizers
La planche campagnarde
Tarte a la flamme Alsacienne
Entrées
Blanc de Poulet aux Nouilles
Cabillaud en croute de pommes de terre
Croquette de Boeuf en Brioche
Duo de canard aux cerises
Filet de boeuf grille, sauce au poivre noir Gratin Dauphinois et haricots verts
Filet de poissons Frit avec Pommes Frites
Desserts
Creme Brulee
Profiterolles au Chocolat et amandes grillees
Prices with an asterisk (*) include tax