Is there a difference between "wheat glutlen" and "vital wheat glutlen flour"? Is vital wheat gluten flour just whoe wheat flour with wheat gluten added?

I want to make some low carb bread, and the recipe calls for vital wheat gluten flour. I went to an Amish store that has bulk foods, and it had a product labeled "wheat gluten" that was brown and of a very fine consistency. Is this the vital wheat gluten flour?

Any help would be appreciated.

Thanks,

Bobby