Ogygos: You start out with the visual distance between Alnitak - Alnilam , representing the distance between the center bases of Khufu and Kafre pyramids respectively. The only measure of this is through Petrie's survey. It is 486.877 meters.
SC: No - this is not the case since Khafre's pyramid is not presently in the corresponding position on the ground from whence it was planned using this technique. The distance between Khufu and Khafre's pyramids as they stand on the plateau today is quite meaningless.