I"d say they are two creation stories meant to teach two different things.
I have never seen a difficulty in seeing the two as simply one narrative, about one creation, with a little back tracking in the second overlapping the latter part of the first section. Those that speak of a difficulty have, as far as I have seen so far, when I have asked, been told there was a difficulty.
Perhaps when the languages were confused, something was done that also gave a gradually appearing difference in looks. There have been experiments made that showed that in areas where there was a small, closed community, the people soon looked very similar to one another, with little variation of their community’s newly developed ethnic look. I can spot a Mennonite in any store, even if they wear modern clothes. They made themselves a different ethnic branch in their generations of isolation. (But now many of them are mixing in with others and will doubtless have descendants that have a wide variety of looks.)
I have been studying languages for years now, comparing them one to another, and it has become evident to me that what I am seeing almost resembles a kaleidoscope, or a Rubic’s Cube in certain ways, in the manner of shifts of form that both seem to have developed from one mother form, and yet seem to leave tracks coming and going from two directions at once.
The tower was built in the plain of Shin’ar, which was Sumer. People still argue over whether the Sumerians were black or white, etc., but the Scripture says that all were arrived there at one point, when the human race was yet small. (By this time, there could have been diversity, passed through Noah’s three sons, reflecting the pre-Flood diversity. I know a family in which three sons were born to one pair of parents: one was red-haired and freckled, one pale skinned with straight blck hair, and one looked like an African in skin color, facial features, and curliness of hair - and these traits, they said, in the last son’s case, reflected a gene they had heard was evident once 16 generations back. I am only passing on the explanation this family gave my mother.)
Interestingly enough, there was from very ancient times, in Sumer, a school for studying languages, and translating texts from one to another, and the school used pictographs, which, like international sign language, could transcend many linguistic defference barriers. That would make sense that the builders of the tower and of the first Babylonian city would try to overcome this linguistic difficulty in a way that they thought would prevent future misunderstanding between one another.
[There is, furthermore, a Sumerian legend about the scrambling of languages.]
Also, Nimrod, who was the builder of the city in which the tower was built, was said to be a son of Kush. The first to rule Sumer called themselves the “black-faced” people, and, similarly, the Greeks coined an exact translation of this, in the form of “Aithiopoi” or “Aithiopsoi”, from which we get our term “Ethiopians”. In African Ethiopia, there is a notable ancient style of building that suggests a fascination with creating things of surpassing height. (A side-note for consideration: At a city called Nimrud, there is an image of a man that looks mighty and rather Ethiopian in appearance - perhaps it is Nimrod himself.)
A lot of things fit the scheme of the Biblical narrative - only much later atheistic guesser’s subjective speculations exist to try to make this perfcet set of correspondences in all of history seem here or there impossible. But the Biblical Record couldn’t, by guessing, have invented a parallel set of elements and time proportions for the spacing and order of these.
Another thing well woreth considering: there is still a power at wok that makes people have problems with various phonetics, according to ethnicity, or even cause people to mix up sounds they well know in their own language, in other languages. By the HOLY SPIRIT this can be overcome.