Warm and Plush is 50% heavier than Warm and Natural. Warm and Natural has a scrim, which Warm and Plush does not have. No scrim means that Warm and Plush needs quilting to be a bit closer together; no more than 5", I think?
Many people have said that Warm and Plush shows the quilting lines more distinctly than Warm and Natural, even aster washing both. That may or may not be a plus for someone, depending on the look the maker is wanting. As I won't ahve that quilt back for another week or so, I can't really do much more than put the info out. Hopefully, I will soon be able to say that I do (or don't) care for it!