The whole California Emissions (CARB) is a complete racket.
Note that the catalytic converters on all cars sold in the States are the same for each model no matter where they are delivered. Plus many cars are California CARB compliant even though they may not be labeled unless actually headed there.
I own a shop in Calif. I believe that most of the cars built from aprox. 2008 are Calif. compliant except for PCM programing. On the subject of catalytic convertors the are two different cats used due to CARB's stricter requirements, federal and Calif, however I have been told that from the very late 2000's the cats are also identical. I am currently having problems finding Calif. legal cats for some of the early 90's models. As far as emission testing if the cat does not appear to be OE we must locate a EO number on the cat and cross refrence it to a data base to be sure that it is a Calif legal cat, talk about [censored] that is Calif. [censored] at it's best.