Mr. Laser Beam wrote:
^ The one on the right has the nametag on it, suggesting it's from TATV. Did they alter the unis for just that episode? (It could also be that the laundry simply washed the color out and made it look faded, like on some of the blue TNG unis)
It is from TATV, but all S4 uniforms seem to be the same shade of blue.
Here's some examples:
Cold Station 12
It could be the lighting after all, but the difference in colour is evident.