∀ {C : Type u_6} [inst : CategoryTheory.Category.{u_5, u_6} C] {D : Type u_1}
  [inst_1 : CategoryTheory.Category.{u_4, u_1} D] {K : CategoryTheory.GrothendieckTopology D} {A : Type u_3}
  [inst_2 : CategoryTheory.Category.{u_2, u_3} A] {G : CategoryTheory.Functor C D} [inst_3 : G.IsCoverDense K]
  [inst_4 : G.IsLocallyFull K] {ℱ ℱ' : CategoryTheory.Sheaf K A} (i : G.op.comp ℱ.val ≅ G.op.comp ℱ'.val) (X : Dᵒᵖ),
  CategoryTheory.IsIso ((CategoryTheory.Functor.IsCoverDense.sheafHom i.hom).app X)