Agree with ruppstang, the chips are "nice to have".
But for "matching" OEM I don't believe anything today is 100% accurate, and that each vendors "blend" of any color will vary somewhat. As I've noted before, I compared 3 vendors "same" color side-by-side and they are obviously different to the eye. Paint a car and park it, most would have no clue.
And I'd bet if you took a few Metuchen and San Jose cars off the line in, pick a year, and the Metuchen were done in November and the San Jose in June, or even 6 months apart on the same line, you would see variations in the "same" color.... you can spray the same paint in different conditions today a week apart and get variations, so the concept that x,000 cars of the "same" color all matched some exact standard is a bit of a stretch IMHO...