This isn't measuring the same thing though - a college degree vs a high-school degree is a very different question than a college degree from an elite school vs

This isn't measuring the same thing though - a college degree vs a high-school degree is a very different question than a college degree from an elite school vs a college degree from a slightly less elite, but still very good school. This also appears to lack any kind of control, whereas the other study tried to control for the student's abilities.