Understanding today's paint codes, help with finding metallic gray paint
Reply #1 –
Just a guess but it might be that the paints for each plant are being sourced from two different suppliers. Therefore the paint supplier for the plant were the Super-Duty is built is putting in a different amount of metal flake in the mix.
When I had my car re-painted, I was able to specify how much metal-flake I wanted and I chose to "up" the amount by a very slight amount. The end result was very similar to what you are describing in the two truck paints.
It's probably not something you would notice unless you parked my car next to another Medium Canyon Red XR-7 that still had original paint. The metallic flake on my car is a little more pr0nounced but not enough to make it look like it's not factory paint.
Brent