{C : Type u₁} →
  [inst : CategoryTheory.Category.{v₁, u₁} C] →
    {D : Type u₂} →
      [inst_1 : CategoryTheory.Category.{v₂, u₂} D] →
        {F F' : CategoryTheory.Functor C D} →
          {G G' : CategoryTheory.Functor D C} → (F ⊣ G) → (F' ⊣ G') → (F ≅ F') → (G ≅ G')