I’ll watch this more in detail later (maybe even today) but here’s once scene difference: from the main release of The Motion Picture on Blu-Ray (top), the 2000 director’s edition (middle) and the new 4k Director’s edition (bottom).
The 2000 director’s edition’s posited that this scene, given that we’re rear facing, should include the nacelle, so we’re somewhere on the saucer rim. Now they’ve gone one step further and redone the windows (and removed half a wall) to match an exact area of the ship and the nacelle now appear lower as this probably corresponds to the rear of the bridge module, below the docking port behind the bridge:
