Anyone used Brown Sheep Nature Spun Fingering yarn?

I just saw this new book pop up on my Ravelry feed today and I decided to spring for a preorder:

The Ravelry page says that the book uses Brown Sheep Nature Spun Fingering yarn, but I’ve never worked with that before. I have a large stash of KnitPicks Palette and I was wondering if anyone knows how compatible those are? Will I be able to substitute Palette for Nature Spun?