I think it's gonna be about impossibly to get that color and make it look the same. That dull light gray. You could try to bring it a-pillar to Napa and have them mix u a spray can of the same color. I just think it will be too glossy.
Napa has a machine that will figure out the paint color. Maybe give them a call. I have got exterior paint from them before and was great quality and was about $25 for a spray can
SEM #15393. Made for plastic, 95% color match and holds up to the Arizona sun for over a year now. You can also paint the bezels that house your window/lock switches in the doors. They never matched from the factory.