[Tallguy]

We can say with confidence that no chambers with volumes similar to the four known chambers in Cheops' and Sneferu's pyramids exist in the mass of limestone investigated by cosmic ray absorption."

I guess it was hard to get "good help" toward the end of the 4th Dynasty?

[SunkenCiv]

There are gross similarities, but none of the pyramids are alike, which is weird, eh? None of the New Kingdom Theban tombs are identical either. Probably due to pharaoh’s preferences, or changing fashions/beliefs, or budgets, or lines of traditions in rival tomb-building families.