Is electric potential energy different from electric field energy?
If you consider charged conducting sphere of radius 'R' and Charge 'Q'. Electric potential energy will be . But when you consider Capacitor, it stores energy in form of electric field so this energy is called 'electric field energy' and it is equal to "U=\dfrac12 E^2 \times Volume". There are the two different way of interpretation of same energy. We can regard the energy of a given systam of charges as being shared property of all charges, or we can think of energy as being a property of the electric field that the charges create. Either interpretatiob leads to the same value of the potential energy.