Not the same as both were already separate and established companies. Krieger formed the brand Criterion from the begining.
Porche/Audi and VW are separate companies,but they do share interchangeable parts and manufacturing processes between all three brands.Parts for one brand may actually be made in one of the other companies factories.According to Kreiger.Criterion is a separate company,and uses an entirely different manufacturing process,even though they may be made in the same facility.
I Don't have a new Weathreby catalog but my 2006 has it in there. They don't list all of their vendors either just some of them.
Check out the Weatherby website.The name Kreiger used to be used often on the old website,but that is no longer the case.