I agree with the existing answers & would like to back them with few relatable examples :
Archetype :
Hero - Few common characteristics of heros are courage, selflessness, humility.
Villain - Few common characteristics of villains are Intelligence , Powerful, Immoral
Personas :
They share common characteristics but also have their own personal traits. Think of :
Heros: Batman & Harry Potter
Villains: Joker & Voldemort
Think & compare their similarities & differences to understand importance of each persona within an archetype.
Archetype is a broad set of users based on common characteristics & Persona.
Persona is a specific instance of an archetype that serve as the surrogate for many of actual users.