In case you need a fact-check:
And, while it is true that the two pyramids have similar dimensions (at the bottom), the Pyramid of the Sun at Teotihuacan does not have a square base, it has a rectangular base.
The Great Pyramid in Giza is also twice as high as the Pyramid of the Sun.
The Mercator projection only distorts N/S, and the distortion is symmetrical about the equator. So it shouldn't make a difference in this case. since corresponding points on both the right side up and upside down map are equidistant from the equator.