Greg
Interestingly, your blue is different than mine. The darker blue on mine is a slate blue (compare your color to mine), and it is definitely original based on the wear that is evident on these parts and the places I uncover. The 2nd (lighter) color is transport blue that I have uncovered peeling the old parts off my truck.
I wonder if the darker blues varied by factory. I think my was built in Ohio, but I need to check that again.
I'll take a close up of the other darker blues that I have in the cab and you should be able to see the difference.