The title says it all, really. What is the difference between Catholic and Episcopal saints?
It’s a subtle distinction, no doubt. There is a simplified view that Catholics pray to saints as intercessors, while Episcopalians pray about saints in remembrance. But that's not super accurate.
The Catholic Church bestows the title of Saint upon an individual through a rather lengthy process of canonization, after which the individual is officially and formally recognized as a Saint. At least two posthumous miracles are required by the Congregation for the Causes of Saints at The Vatican.
The Episcopal Church (TEC) does not canonize, though she does recognize most of the Catholic Saints by name (one exception I can think of right now is St. Valentine.) Furthermore, TEC includes all baptized Christians in something we call the Communion of Saints, believing that everyone has the potential to be an influence to another in faith.