First welcome to the site - hope you find the focus and information here useful
Guess your asking about a car with a fold down since you didn't specify
Don't believe that the back half (plastic interior panels and such) finishes are different between standard, deluxe or Mach I interiors as far as finishes go. But the color of the panels were handled differently from interiors such as white, blue and others when it came to the following rear panels
Black corner/trap door sides, trap door and panel over trap door
NOTE: Carpet has been replaced