Same size hexagons on curved surface like hemisphere

See also some previous posts on this

You can’t cover a full sphere with just hexagons. You can cover a half sphere, but the hexagons will have to vary a lot in size.
If you include some pentagons or heptagons you can get less variation in size. For general freeform surfaces you can get this sort of pent/hex/hept mesh with TriRemesh. For spheres specifically, you could use a geodesic dome, based on a dodecahedron.

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