They are all natural colours except W&W which is made of bleached cotton. Bosal and W&P are bit whiter than W&N and seems to have less black bits. All are made of organic cotton, needle punched without any glue and made in US. W&W and W&N have scrim to keep cotton fiber together. Bosal is the thinnest and W&P has 50% more cotton fiber than W&N.
Do they look different effect on quilting? Yes and I made samples. I used same fabric for the tops and same calico for the backs. Thread are same Aurifil 50wt. And same quilt design. I didn’t include W&W because that is basically same as W&N. It’s a best option for whiter quilts since won’t affect the colour.
Not sure photos here can show difference but here you go.