The correct statement is:
The total charge before and after the change remains the same, but the total atomic mass is different.
In nuclear reactions, the number of protons and neutrons can change, particularly in processes like beta decay, fusion, and fission. These changes can result in a different total atomic mass before and after the change. However, the total charge (which depends on the number of protons) does remain constant if you consider the overall charge of the system or during a balanced reaction.