If you compare the sun to its descendants, you’ll notice that the descendants don’t quite shine as brightly as the sun does. You don’t like to compare them, because each sun is special in its own way, but the descendants just aren’t quite as shiny as the original.
While you’re looking up at the sun and its descendants, trying to compare them to one another, a flock of condors (こん) flies by, blocking out the sun. There’s a great many condors, and they manage to totally block out the light from the suns.
Currently there are no similar looking kanji which exist in the WaniKani learning system