I bought a 70 Chally that was factory plum crazy. it was repainted in sherwin williams and the color was too light and silvery for me.
I used PPG and it was much darker and richer color. It seemed very correct to my eye..

Back in the day, the factory FC7 color was burned, baked,peeling in three or 4 years ! One of the worst colors to keep original.. , the UV really attacked it...