I had the same idea.
I find no interesting variation present in the top 100 wheels, per https://pastebin.com/6wbUnhWg
(The cases that I looked at where there are different metadatas but no “interesting” variation is things like different line endings for metadata generated on different platforms)
obvs that is only 100, and there is room to quibble about what is “interesting”, feel free to make this a starting point for further exploration.