The Death Star interiors have always been inconsistent. It's part of the cinematography, and it most likely depends on the lighting used for each shot and so forth. In the GOUT they tend to look one uniform shade of dull grey, but that's only because of the image being faded and washed out. Saturate it and the variations become clearer, as they are in the Technicolor screenshots.
One of the 2004 version's big mistakes seems to have been making the interiors the same shade of blue most of the time, which has the repulsive side effect of making everything else blue along with it, and causing other elements that used to have consistent colours to fluctuate wildly.
That said, the blue does look way too strong in that second screenshot.