They do change the menus so there will be different ones on different sites depending on when they were posted. There's no way of knowing exactly what will be on the menu so I would go with the most recently dated one. Certain favorites and signature dishes haven't changed in years (eg. cheddar cheese soup, breadsticks, filet with mushroom risotto.) Is there something in particular you were hoping to try?
Since becoming a Signature at dinner I've noticed more frequent changes in both the lunch and dinner menus at Le Cellier. Also, they will not make lunch items at dinner or vice versa, such as the cream cheese mashed potatoes.