Two identical cubes, two different grids

Hello forum,
consider the two identical cubes in Fig. 1 (one cube generated in a CAD software, that the copy shifted in space).

Two identical set of meshing parameters are used for surface meshing, running mmg on disk. See Fig. 2

Two different surface grids are generated. See Fig. 3

Grazie mille
GiovanniMMG_mesh cubes.pdf (66.9 KB)