This is what happened to my brilliant white bumper. My buddy who owns the paint shop used ppg mixture and the pearls came out too be too fine. I went to get the Glasurit sample and it has the right pearls now.
Sometimes a different paint brand will be off. I know the Glasurit brand matches very well. I believe that's what bmw uses.
The same formula could be applied to ppg paint or dupont but it may not come out the same.