Wheels wear paint differently and something as simple as the brake pad dust can cause the color appearance to change. Remember, back in 2015 they changed the pad compound on our cars to be (What I believe, correct me if I am wrong) to a better compound but has better bite.
In my opinion, I think that any local paint store should be able to look at the wheels and break out the fan cards or even a paint matching device to come up with a code and the amount of variance between the factory color and what you guys have. Any local paint supply store should be able to mix up a few ounces of urethane paint that is the same color.. might take a day and cost around 15 bucks, but you are getting actual paint... not mass produced touch up stuff that runs and is like piss. Remember... ford also uses waterbased paint to paint cars and I am assuming the same for wheels unless its a powdercoat style paint that is baked on or has a electrolysis style way to apply paint to the wheels, but I doubt the last part due to the fact that the wheels are an alloy part and not a steel, but still not something to be dismissed.
The bad part about this is that for replacement wheels, that means there is a color variance. This means that if you ever need a replacement wheel there is a large change that you will not get a matching wheel color, aka you crack a wheel, go to the dealer, order a new one, and low and behold when you get it home it does not match the other three because ford took the generic route on that wheel. Scary much?
I think when I get some time I am going to look into if there are different part numbers for that wheel or if they are all the same across the years.
