I see, this makes sense. Thank you so much for your help! You're fantastic.This is new territory to me. I'm not familiar with the Pace setter cards. It appears that they are based on the 300 model and are a special sub variant.
We see the second digit coding, the 0 Zero in the second VIN position, designating a sub model or "special" model used in later years to designate something similar like the 66 S/S Darts, the 67 S/S Coronet and GTXs, and 68 S/S Hemi Darts and Barracudas. They ar3e all social purpose and built version of an existing model.
So it appears to me that the Pacesetters were a limited run sub variant of the 300 meaning they would have some of the same characteristics of the 300, like the interiors, yet have enough changes from he original model to warrant a sub variant and different VIN. Its not unusual to me to see the interior code for both the 300 and Pacesetter.
There are folks on here far more well qualified than I to answer you question in better detail.