Hmm. Went through that with my older toy car, converting it to R134, from what was it? R33? Now in Washington they are changing that yet again?
I thought that AC refrigerant for cars was a national level regulation, I can't imagine that car manufacturers would support states having differing standards on that. The manufacturing costs would go up.
That being said, California is stupid enough to demand their own gas formulation.
That's one of the reason that gas in CA is more expensive than everywhere else, once again, self-inflicted stupidity, much like what this sounds like.