My reply is based on my experience on the Koningsdam. If someone who has sailed the Noordam disagrees, please post.
First, if your traveling companions are in a Neptune suite and you are not and you do not have Club Orange, you will not be able to eat with them if they choose to eat in Club Orange. But they could eat with you in the MDR if they want.
Second, the Lido does not have table service, except for water and other drinks. It is a buffet for breakfast, lunch, and dinner.