Roundness and development

Hello
I think about the " roundness " of the Earth - which is not round - so I have fun developing a sphere with SW, and I am surprised by the shape obtained, I explain: having created a sphere by revolution of 359.99° to be able to make a flattening, I get a flattening, also after having made a removal of material in its center by a middle plane, I get another form of flattening, different from the 1st, outer outline...
Question: Why? Although there is an approximation in the 1st flattening, why such a change in the 2nd, the algorithm?
I attach the SW 2022 file
Kind regards
dev 1.SLDPRT (274.7 KB)

Erratum!!! Attached file SW 2020!!