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For what it might be worth, the part number on two of my other S4 cars is the same as the one previously shown by me. Here are a couiple of pictures. The one label is off of my other white 87 S4 and the other one is on one of my red 88 S4s. Of course you cannot read either label, but you can make out that the part numbers for the label both end in 03.
I just received a PPS for my 78, and it says Grand Prix White/R4.
Porsche's COA/PPS are wrong a disappointingly high fraction of the time. Unless someone did a really thorough repaint, the floorboards under the front carpets and foam pads should be the original body color. What color are your floorboards?