{A : Type u_1} →
  [inst : CategoryTheory.Category.{v_1, u_1} A] →
    {A' : Type u_2} →
      [inst_1 : CategoryTheory.Category.{v_2, u_2} A'] →
        {B : Type u} →
          [inst_2 : CategoryTheory.Category.{v, u} B] →
            ((CategoryTheory.Sum.Swap.equivalence A A').congrLeft.trans
                  (CategoryTheory.Sum.functorEquiv A' A B)).functor ≅
              ((CategoryTheory.Sum.functorEquiv A A' B).trans
                  (CategoryTheory.Prod.braiding (CategoryTheory.Functor A B) (CategoryTheory.Functor A' B))).functor