Yes, my eyes are done color matching. My folks used to own a print shop, so more information about color matching, indexing, pigment formulas, etc., rubbed off on me (pun intended - sometimes literally) than I want to think about. After some years of dealing with overly picky customers, I refuse to get bent out of shape about which shade something is, especially the nomenclature game. That's not to say it isn't important. To many people it is, for a variety of reasons, and that's OK. That's why there are so many Pantone color card charts, to get or match the exact shade, and why you must replace them every few years as they start to fade from chemical fumes, UV light from florescent lights, etc. And they are expensive to replace. We kept our binder of color cards in a dark desk cubby in an office with good ventilation with a door to keep unnecessary light out. Now, it is done electronically, but even that relies on the monitor being perfectly calibrated as well as the camera used to source an image of the item or color to be matched.
Probably both. Note the automotive colors were for late-'50's model cars, and Fender started the colors on guitars and basses in the early '60's.