The long radical and the long kanji are the same!
This kanji also means leader, because the longer a person is, the better a leader they'll be. Or maybe it was... the longer they've been somewhere? Whatever, longness = leaderness, you know?
You see a very long person. It's Mrs. Chou (ちょう), who has made herself long, like her street. "I made myself long so I can watch more of the street, my domain. I'm the leader of these streets. Watch yourself not-long person," says Mrs. Chou.
Currently there are no similar looking kanji which exist in the WaniKani learning system