I did a search and they are like the CB, the factory never intended for them to be matching numbers. A guy on another forum was saying how he had to make his non matching due to an issue with his stock cases. It turns out he meant he replaced his damaged 75 cases with a set of 76 cases, so they would not be the correct matching year, but not VIN.
That said, I'm surprised you don't know if yours are matching or not. My guess is they are not.