I believe that the features officers in ANH have the same color uniform as those in TESB and ROTJ. There are other uniforms as well, tan, white, black, but the top people all seem to have the same greenish uniform. When I color correct ANH for other things, Tarkin’s uniform takes on a similar color to the Admirals from TESB. And the difference in uniforms in that pic above is only lighting. Those are the same color uniforms for the old and new Admirals.
I’m not entirely sure. I think for TESB at least some of the officer uniforms were updated, with different ensignia, and a more bluish green atire, as is evident on the above photo. Left the ANH colors, right TESB’s update.