∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] (J : CategoryTheory.GrothendieckTopology C) (A : Type u')
  [inst_1 : CategoryTheory.Category.{v', u'} A] {X Y : C} (f : X ⟶ Y)
  {Z : CategoryTheory.Functor (CategoryTheory.Sheaf (J.over Y) A) (CategoryTheory.Sheaf (J.over X) A)}
  (h : J.overMapPullback A f ⟶ Z),
  CategoryTheory.CategoryStruct.comp (J.overMapPullbackComp A (CategoryTheory.CategoryStruct.id X) f).inv
      (CategoryTheory.CategoryStruct.comp ((J.overMapPullback A f).whiskerLeft (J.overMapPullbackId A X).hom)
        (CategoryTheory.CategoryStruct.comp (J.overMapPullback A f).rightUnitor.hom h)) =
    CategoryTheory.CategoryStruct.comp (J.overMapPullbackCongr A ⋯).hom h