We would expect different proportions of the isotopes on the Earth and the Moon. This is because the Moon according to the models would have a greater proportio

We would expect different proportions of the isotopes on the Earth and the Moon. This is because the Moon according to the models would have a greater proportion of its mass made up of the theorised collider "Theia" than Earth. In this particular experiment they showed the isotopic proportions matched between here and the Moon.