Relatively small models are typically filmed with longer lenses to make them look larger. The establishing shot was filmed with a really long lens so that they could make the tower passing over the camera more impressive. The same technique was done filming the opening shot of ANH. The point COULD be to make one seem bigger than the other, but it would seem that they're just doing it to achieve the kind of shot they wanted to do.

As I said, it COULD be Executor, but there's only one clue to suggest as such - which would be the original coloring. In order to even start to communicate that it's Executor, the shot needs to be flipped. Plain and simple.