Ted - I too am only discussing the backs of the cards and I believe there are three key points to answering your original question:
"Does this suggest that the UZIT backs and the PIEDMONT 460/42 backs were printed simultaneously ?"
1) I do not believe there are two color variations of Uzit, just differences in the amount of the same color ink applied. The image I included in my post above hopefully illustrated that point.
2) Unlike the Uzit backs, Piedmont 42's were printed with two different color blue inks.
3) A comparison of the Uzit subjects to the light P42's or to the dark P42's show that the two were not printed simultaneously.
You included a lot of great information in your post but I don't believe there are any connections between any of the stated facts that would change the three points I posted above.
I hope that helps.
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