That's pretty clear.
On the blue one, especially on the first pair and the pair showing the hat you can see how the dark blue is all over instead of just highlights for shading.
One way that can happen is a dry plate, where there isn't enough wetting to repel ink from places you don't want printed.
But the big key with that is that it's usually in either small unprinted areas, like between frame lines on a Piedmont Reverse, or if a larger area it ranges from haphazard and sloppy looking to literally everywhere being printed, including borders. That's not happening here.
I believe the actual art was changed, a nice example of a running change in the 150's.
I think the blue one will be the older one, perhaps a change to use less blue to save ink, or if the uniforms weren't dark, to fix an error.
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