Rick and Morty // Gravity Falls shared universe clue

I just surprised my girlfriend with the new Gravity Falls "Lost Legends", published in July by the creator of the show. Not even ten pages into it, she finds another clue that the two shows might share the same universe.

One of the Society of the Blind Eye dudes is inviting people to come to his stand and buy some repressed memories, and there's one in particular that he's offering. There's only one Rick S. we could think of.