You do know that an amendment to the Constitution may change previous parts of the constitution right?
See Proabiton
Of course, but the principal sponsors of the 14th Amendment, particularly Bingham, for example, stated that there was no intention of the part of the Congress to alter the Section II presidential eligibility clause. You could check the Congressional Record. There is also the evident fact that the purposes of the 14th Amendment was to make it clear that black Americans were citizens who could not be deprived of or denied all the rights of citizenship. It is also clear that the 14th Amendment affected citizenship, not natural born citizenship as set out in the presidential eligibility clause.