It is not logical to conclude that every account of the tower of babel was based on a single older account. There is no evidence or logic to support such concepts.
The Genesis stories of Creation and Flood are indeed based on Babylonian creation myths (eg
Enūma Eliš (Epic of Creation),
Epic of Atrahasis &
Epic of Gilgamesh (Nineveh has tablet 11, which contain the story of Utnapishtim), which in turn were based on even older Sumerian myths (eg
Eridu Genesis (eg Ziusudra),
Enki and Ninmah,
Song of the Hoe, and allusions of Ziusudra in the poem called the
Death of Bilgames).
The Genesis connection to Babylonian myths were most likely learned by Jews who were living in exile at Babylon as hostages, during the 6th century BCE. There are no older versions of Genesis, dating to the Bronze Age (c 3100 - c 1050 BCE)
The Tower of Babel don’t exist on any of Babylonian & Sumerian sources (about the creation & flood myths) that I have mentioned above. But as Jews were living in Babylon when Nebuchadnezzar was reigning emperor of Neo-Babylonian empire, Jews must have been inspired by the enormous ziggurat completed by then.
This ziggurat was called Etemenaki, was actually started construction during the reign of Neo-Assyrian ruler Esarhaddon (681 - 669 BCE), and continued to be constructed by Nebuchadnezzar’s father, Nabopolassar (626 - 605 BCE), before Nebuchadnezzar (605 - 562 BCE) completed it.
There are no Genesis written in the Bronze Age; there were no texts of any kind, not in clay or stone tablets, not in any parchment or papyrus. There were no biblical texts whatsoever.
I know there are some Jewish traditions that say Moses wrote the Genesis as well as Exodus, Numbers & Leviticus, but no such person (Moses) exist in Late Bronze Age.
And btw, cladking. The only tall structure in Mesopotamia built in the late 3rd millennium BCE, was ziggurat built in Ur, known as the Great Ziggurat of Ur, built by Ur-Nammu and completed by his son ShulgI (rulers of Ur during its 3rd dynasty), 21st century BCE. The height is about 30 metres.
There are older ziggurats, such as the ziggurat in Uruk, in the Anu District, started around 4000 BCE, with White Temple constructed on top of the ziggurat in 3400 BCE, and the ziggurat & temple were dedicated to An (Anu in Akkadian). This ziggurat was about 21 or 22 metres tall. The Elamite ziggurat, known as the Sialk Ziggurat was built around 3000 BCE, in Tepe Sialk.
Even the smaller pyramid at Giza, the Menkaure Pyramid that stood 65 metres tall, were taller than all extant ziggurats in the 3rd millennium BCE. But the Etemenaki ziggurat (91 metres tall) was built in the mid-1st millennium BCE. The Khufu Pyramid or the Great Pyramid (146 metres) still stood taller than the Etemenaki.
but regardless of which monuments were taller, 3 languages existed near each other during the 3rd millennium BCE, Sumerian, Akkadian and Elamite, and that’s ignoring the Egyptian language and the languages of Indus Valley Civilization. Multiple languages already exist in the 3rd millennium BCE, so the whole Babel event is merely a myth.