So about my theory that the E3 map is not actually Urchin Underpass, I've taken these shots, most of them come from a single trailer, the Japanese Overview trailer but a single screenshot is also from a GameXplain match. (JP overview: https: //youtu.be/9MozufxTrb8 I'm not sure how to not expand the video, remove the space to actually go to the vídeo).
As you'll see on the comparisons, there are significant differences between both maps, and all this footage is in the same video, so it is not just alterations that were done through development, but actually two different maps in the games, unless for some modes it changes some aspects and that is why both versions are shown.