There are probably very slight batch to batch differences between them, but unless one has them side by side in the exact same setting it would be impossible to perceive any difference.
If one is looking at pictures, then that's going to be a rabbit hole as the JC dials are highly reactive to changing lighting conditions. That's a key part of the charm of a D-blue as it always looks different, then there will be times where it will surprise in a most pleasing manner.
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