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What kind of printing are you looking at? Large format? Vinyl?
I have a good friend who's in the business. Happy to intro for you, just need a little more detail.
Kevin
The Essential 993 Companion states that the 2-letter identification is a calculated code based upon all the interior color codes used. It also says that there are an "enormous" number of possibilities. I know that I have tried to determine the color of my blue interior, and that there are 5 midnight blues on the short list of this post and at least 10 midnight blues in the book list. There are 8 marble grey entries, 2 of which are black on marble grey. All of the book codes are three-character codes.
I suspect that the differences in the various combos are simply bits turned on/off in the ASCII or HEXIDECIMAL codes in the Porsche system.
The book also states that some colours have different codes. Which shade applies to which model is determined by model year, It may be that the slight differences in the codes indicates the model year as well as subtle twists.
AND, your car is great looking. I really like the marble grey.