Not a Variation, Sorry
Sorry, but this is simply a result of shifting ink densities on press, not a true variation, or even a printing error.
Throughout the press run, ink flow must be calibrated to maintain consistent application to the sheet. Both examples show the extremes of not enough cyan ink (what you refer to as the gray variation) and too much cyan ink (resulting in the overall heavy blue tinting).
Its very easy to see in the word ANGELS. Those letters are made up of a mix of yellow and cyan inks. See the difference in tin due to the excess blue ink?
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