vital wheat gluten flour

are Arrowhead and Bobs the same products or different?

http://www.arrowheadmills.com/products/product.php?prod_id=257&cat_id=64

http://www.bobsredmill.com/product.php?productid=3552&cat=0&page=3

they appear to be judging from the protein/serving relation.

I'm looking to make bialys.  Most recipes call for gluten flour.  Would that be this products or just the usual of adding a portion to a dough?