Duality / Dualidade (1)

Cube (1) and Octahedron (1) puzzles

Cube (1) has 2 solutions (1 equivalence class). Octahedron (1) has 16 solutions (3 equivalence classes). The solutions in the photos are dual. Remark the numbers around a vertice in one solution and the numbers in a face of the other solution: they are the same.