Matching "authentic" colors, even for a professional with access to a lab, is not quite an exercise in futility—but it comes close, even for the paint manufacturer. (Been there. Done that.) That's only one reason you can buy two bottles of the same color, from the same manufacturer, that don't match. And once the paint is applied, either in the "real world" or in your spray booth, the variables don't just multiply, they exponentiate. Color matching in the paint industry is not an exact science. It's a blend of science and art. Like I said, been there, done that.

So knocking yourself out, and wasting large quantities of Very Expensive Paint, to get an exact match, even when matching to an FS color chip, is not only futile, it's false in so many ways. Close enough is not only good enough, it has an excellent chance of being TECHNICALLY AND HISTORICALLY CORRECT. Once a paint is applied to a real vehicle, and that vehicle is exposed to the elements, especially sunlight, it begins to change immediately. After a week in strong sunlight, some paint colors change drastically (all historical "olive drab," for example, is notorious).

So if it looks right to you, it's close enough. Anyone who criticizes one of your builds because they think the color is wrong, is wrong, period. That is, or course, assuming you didn't substitute hot pink for olive drab.