I have added many photos from Camera to Album X for sorting. Is there any way to automatically add all remaining photos in Camera to Album Y?

Album X is supposed to be a "best of" album. However, I keep on noticing very good photos that I previously missed, and am adding them to Album X in an ad-hoc manor. It would be better to add all photos not already in Album X to Album Y so that I can go through them again as a group and promote more to Album X as necessary. Is there a way to automate the process of adding the thousands of photos in Camera which are not already in Album X to Album Y? NB, as an alternative to automatically adding all photos to Album Y which are not already in Album X: Is there a way to view all the photos in Camera alongside some kind of identifier of whether they are also in Album X? Even that would make the sorting process much easier.