During World War II, some world's had a plethora of costumed crusaders, others had few or none. On Earths One and Two. Here is an example of two operating at the same time.
While Dare of Earth-One would become the grandfather of Ronald Raymond, who was himself the superhero known as Firestorm, there is no known connection between the Dare of Earth-Two and Ronnie's counterpart of Rod Reilly, aka Firebrand. Although there may have been, given that Dare's older age from that of his twin.