generally speaking a 1/0 is just slightly larger than a #1.
IMO the standard of what is a hook's size should be set using the "most" popular type of hook... ie. mustad O'Shaughnessy.
This website pretty much answers your questions
http://www.go-saltwater-fishing.com/...ook-sizes.html
but unfortunately makes it no easier in your search for a jig mold. Best way to overcome this is to determine exactly what type of hook is used in an example of what size jig your going for. Then just use the same brand and size.