If you remember the formula for potential energy,
then this question is a piece-o-cake.
Potential energy = (mass) x (acceleration of gravity) x (height) .
-- The object's mass is the same everywhere.
-- You said that the height is the same both times.
-- How about the acceleration of gravity ?
Compared to gravity on Earth, it's only 16.5 percent as much on the Moon.
So naturally, from the formula, you'd expect the Potential Energy to be less
on the Moon.