The best option that describes the relationship between the two ideas is Contrast.
While the first idea is about Peter Parker's collection of Superman comic books, which is associated with a different character (Superman), the second idea highlights that his collection was featured in the local paper, emphasizing the significance of such a collection in a community where it might be unexpected, given that Superman and Peter Parker are from different comic universes (Superman from DC Comics and Peter Parker is Spider-Man from Marvel Comics).