Is the GMAT just an SAT?

I am tutoring a student for Quantitative, and he was wondering why all the geometry and not more statistics and financial math. Also, there doesn’t appear to be any finance or economics.

The math concepts that the questions are based on are the same. However, the GMAT questions become much more difficult than the SAT math questions if you answer a lot correctly (the test is adaptive). Also, the SAT does not have data sufficiency questions.