Question

Does it have any difference between atomic mass and mass number​

Answer 1

Atomic mass is the weighted average mass of atom of an element based on the relative abundance of the element's isotopes. The mass number is a count of total number of protons and neutrons in an atom's nucles

Answer 2

Atomic mass is the weighted average mass of an atom of an element based on the relative natural abundance of that element's isotopes. The mass number is a count of the total number of protons and neutrons in an atom's nucleus.