No, carbon-12 and carbon-14 do not have the same atomic mass.

Here's why:

* Atomic Mass: The atomic mass of an element is determined by the number of protons and neutrons in its nucleus.

* Carbon-12: Has 6 protons and 6 neutrons, giving it an atomic mass of 12.

* Carbon-14: Has 6 protons and 8 neutrons, giving it an atomic mass of 14.

Therefore, carbon-14 has a higher atomic mass than carbon-12.