Having iconic and memorable “establishing” shots of diminishing size both moving from left-to-right across the horizontal plane…
…that clearly “established” the trench being the same one, was actually a clever ruse to confuse the audience all these years. It brilliantly fixes the wrong location of the action in the minds of the viewers in 3-demensions, on an almost subliminal level. Well played Lucasfilm, well played.
Like they said in the article, those shots are NOWHERE near each other in the film.
Just timed it, they are 4 minutes apart. The first shot is before they “cut across the surface to try and draw their fire” even.