Referencing the book Physics for Scientist and Engineers, Ninth Edition, the book says that "Potential Difference should not be confused with Difference in Potential Energy."
I also reviewed several internet sources that say "Potential Difference is the difference in Electric Potential Energy between two points."
What is the difference between potential difference and a difference in potential energy?
Technically "potential difference" is the difference in electrical potential, i.e. $\Delta V$, not the difference in electrical potential energy, $\Delta U$. Potential difference ($\Delta V$) is also called voltage, in certain contexts.
However, many people and sources are sloppy about their terminology, and they will say just "potential" when they really mean potential energy. An expert could tell which is meant based on context - or, in some cases, that it doesn't matter. Since potential energy is related to potential by $U = qV$, if the charge $q$ is known and constant, you can usually say the same things about either quantity $U$ or $V$.
