Paint on car bodies and wheels fade over time while in the sun. So using an exact factory paint code mix will not match a car that has been in the sun for many years. A good body shop may be able to adjust the mix to better match, and they often will blend the paint into adjacent body panels. I have done a few body panel paint repairs over the years with professional paint mix. One example, on the same car, and same paint supply shop, I had a quart mixed and it matched perfect. Fast forward five years and I needed to do another repair and the paint was way off. I ended up taking the fender into the paint shop to show them the original color and how bad the paint match was. In this case it was not fading but a bad paint mix.

Maybe a fellow forum member near you would volunteer to meet in person (with social distancing), so you could compare the wheels and center caps which may give you an idea.