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Just a guess, but are you sure one of the Stingrays is not Ceramic Matrix Grey? Looks white, but nothing like Arctic white. CMG did not come out until 2018 so who knows.
No, Artic White did not change paint codes. In fact, Artic White on the C8 is still G8G (WA9567). It's the same Artic White used by GM since 1989.
Your two cars have most likely experienced many differences in their lifetimes that could change the color somewhat. Sun exposure, cleaning and waxing (or ceramic coating or whatever you and him used), etc..
And the comment about films or coatings may be a possibility.
The OEM factory applied rock chip protecting film on my rocker panels (below the doors and in fromt of the rear wheel openings) has yellowed and I don't like it so I'm going to have it removed. It yellowed in spite of my car being always garaged.
I'll ask my friend about any films or coatings on his car.
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What Zymurgy mentioned could be a factor - the same paint codes, even with different years should be a very close, if not exact match from the factory.
Different batches of paint at the factory will vary slightly. In fact the manufacturers actually distribute factory "variant" paint chips to repair shops so the correct formula can be made. Some colors only see 1 or 2 variations, while others can have 5, 8, or even more.
A body shop owner once told me that white and yellow are the hardest colors to spray and match.
If both cars have not had paint work done though, then I don't know. I can only think that maybe one car has had expel applied all over and it had faded some.
Why would you be surprised? Different model years and no factory guaranty I'm aware of that the color "labels/names" must mean identical colors over years.
No, Artic White did not change paint codes. In fact, Artic White on the C8 is still G8G (WA9567). It's the same Artic White used by GM since 1989.
Your two cars have most likely experienced many differences in their lifetimes that could change the color somewhat. Sun exposure, cleaning and waxing (or ceramic coating or whatever you and him used), etc..
I should also mention that most white paint formulas have blue, yellow, red, etc...
even if you had the exact same year, if it wasn't built in the same week, it will be slightly different.
Some whites even have black in them. That's why paint work is expensive. You are paying for labor and color matching time which could be rather extensive on certain colors(tri-coats).
I bought a quart of Arctic White years ago from an automotive paint store and watched them mix it. It started with pure white and added a small drop of deep blue. That's what makes it look like freshly fallen snow.
Body shops hate painting white cars. It is one of the hardest colors to match and often results in repainting the whole side of a car for a minor repair. We used to always say, “if it ain’t right, paint it white.” for a reason, but that reason had nothing to do with trying to color match panels. All it takes is a few years of weather, sun, humidity, etc. exposure to require adjustments from the stated paint code when trying to match the paint.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.