P: A way to compare two collections of photos to decide what photos to include in final set

I would find it a real fit for my workflow to be able to have two sets of photos side-by-side (one set on each of two displays, for example) to visually see what is included in the intended final photo series and what are the candidates that I am considering to include in the final set.

Currently I use stars and filters to restrict a collection to include only intended final photo set or candidates, but there is no way for me to see the final set on one group and candidates in another at the same time — I can see photos part of both sets in the same set (for example, marking intended final photo set photos with five stars and candidates with four, and set filtering to include four or above stars), but that's not the same as looking those two sets side-by-side.

Think of it how you would build your photo series with real photo prints: you would lay the inteded set of prints in front of you in one group, and candidate prints on another group next to intended set, and you would look both sets and glance and ponder each set and photos in them and move photos from one set to another to see which photos would make best sense together and make the most impact for the photo series.

A way to do that on Lightroom, that's what would make me make do my work better.