I saw the following royals at the lunch:
The Queen, Charles, Camilla, Harry, Andrew, Anne, Richard, Birgitte and Edward Kent.
Of those only Harry didn't also attend the Banquet.
The additions to the Banquet who I didn't see at the lunch (but they may have been there) were Edward, Sophie, Micheal, Marie-Christine and Alexandra.
That means that 8/9 who attended the lunch also attended the banquet while only an additional 5 attended the banquet who may not have attended the lunch (the video footage didn't show everyone who went into the room to look at the stuff and the coverage tended to move around focussing on where the Queen and Mr Trump were rather than showing everyone. You had to look at those in the background to see who was there. I may have missed some of the royals attending the lunch such as the Wessex's or Alexandra.