Gravity Falls X Rick and Morty: Callback or Coincidence?

I noticed something just now while watching Auto Erotic Assimilation. Just a throwaway piece of animation:

Rick_and_Morty_Season_2_Episode_3_Auto_Erotic_Assimilation_Full_Screen_720p_HDIt reminded me of this little bit of twin humour in Gravity Falls:

Gravity_Falls_SDCC_2015_Look_AheadCoincidence? Yeah maybe. I have no idea if the production schedules would have allowed this to happen on purpose, but it still makes me smile. And, I mean, the two shows have done this before:

So, in conclusion, I’m bored and it doesn’t take much to amuse me…