I do not think that it if Inca Silver. I found that RAL 7034 is a very close match. The main difference that I see is that the original Luna Silver has some small quantity of metallic inside, but it is very difficult to guess what and how much.
I think that I will go for a traditional acrylic with a polished transparent finish to not complicate the project. I prefer to maintain the original finish on the neck, and actually I prefer Luna Silver to Ferrari Red, even if I am Italian.