a. Are potential difference and potential energy the same?
b. If they are not the same, then define them
c. Also state how they are related.

Explanation

a. No. Potential difference is a field property. Potential energy is the interaction energy of charge configuration.
b. The electrostatic potential at a point in an electric field is defined as the work done in bringing a unit positive charge from infinity to that point against the field. Electric potential difference between two points is equal to the work done in moving a unit test charge between them.
The potential energy of a system of charges is defined as the work done in bringing the charges from infinity to form the system. Potential energy, `"U =Potential difference " xx " Charge"`