Pablo Hidalgo mentions that the Imperial officer’s attitude towards Vader in each of the three symbolizes how well known he is - Motti in Star Wars, Ozzel in Empire and Jerjerrod in Jedi. I think it sounds reasonable, and extends to most characters in those respective films. The idea, I think, is that after the Death Star he and his Death Squadron became way more hands on in fighting the Rebels across the galaxy. Whereas before he was mostly stoned off his ass in Mustafar or doing Sith/Inquisiting stuff, I’m guessing, which is more in the shadows and less open.