I assume that that is supposed to be Tarkin and that they obviously re-cast him. However, his rank plaque is different, so it may not be him. But he does have the same number of squares, and I don't know if the colors actually mean anything in the Imperial rank structure (sorry, my Star Wars geekdom does not extend that far). Also, since this takes place just prior to ANH, it is possible that he got an intervening promotion or change in duties that would have warranted the change. I am curious to know.