I think the factory paint and interior codes are used for any model they produce. Some are only available on some models some years but they do seem to reuse the color from time to time. I think the 928 issue is a red herring. Think of Guards Red exterior, it was available on 911, 944's Boxsters and Caymans and newer 911's too. I'd be surprised if the Cashmere interior is one code for a 928 and another code for the 911...but then again...
