It would have to be out of #9 or #82. I'm pretty sure #9 has a higher oil content and #82 and that #82 is ever so slightly more abrasive than #9. I'm also pretty sure that the #8x series was developed for clear coats in particular where as products such as #9 are originally developed for single stage paints (might be wrong though). So, my guess would be #82 is the closest to CCBS.
Cheers,
Phil