Your question in other words is: How far was the primordial Milky Way from these two galaxies 13 billion years ago? I don’t have the answer on hand but it migh

Your question in other words is: How far was the primordial Milky Way from these two galaxies 13 billion years ago? I don’t have the answer on hand but it might be related to comoving vs. proper distances: https://en.wikipedia.org/wiki/Comoving_and_proper_distances https://en.wikipedia.org/wiki/Comoving_and_proper_distances