I just dabble with Envelope Stamps, but these two caught my eye. Scott Specialized only mentions a "Blue" for U330. Are these just different shades of the same envelope? (One on right definitely looks darker to me.)
I see that there is another version of this cut envelope, identified as U377. Scott says, "similar to design of 1887-95, but smaller." Is it possible the color changed slightly also? Doesn't seem any smaller, but I don't have any other ideas.
Shade varieties happen for a number of reasons with the typical reason being the thickness of the ink applied. The number 2 reason is humidity which affects #1. And, of course, variations in the ink components. Measuring methods were rough and lighting was not the best, frequently being sunlight through dirty windows, so variations in the completed ink formula also occur.
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