Also if they did have identical sizes and there was a need to measure those sizes, we would expect a lot of much simpler devices to measure them - say a flat pi

Also if they did have identical sizes and there was a need to measure those sizes, we would expect a lot of much simpler devices to measure them - say a flat piece of metal with differently sized holes. Fancy versions like the dodecahedron might exist, but they would be outnumbered by the utilitarian devices.