Difference between Chrysler Blue and Chrysler Turquoise engine paint colors?

I think my first spray can that had a hint of green in it was from O'Reilly's. The second with a hint of green was OER brand. The paint on my engine looks most like the first picture in Abody Joe's post. There were probably variations in the same color at the factory and then add 50 years of aging on top of that. That means there is no definitive color for modern paint manufacturers to match to. It is too expensive to keep buying different brands trial and error. I will probably just use what I have. I want to keep my car authentic and factory original but it will not be judged at a show.
I had a similar dilemma with various interior colors on my Lasalle. I ended up using oil base/alkyd paint and matching colors myself with universal tint colors.