∀ {C : Type u_3} [inst : CategoryTheory.Category.{u_1, u_3} C] (R : CategoryTheory.Functor Cᵒᵖ RingCat)
  {F : CategoryTheory.Functor Cᵒᵖ (Type u_2)} {G₁ G₂ : PresheafOfModules R} (f : (PresheafOfModules.free R).obj F ⟶ G₁)
  (g : G₁ ⟶ G₂),
  PresheafOfModules.freeHomEquiv (CategoryTheory.CategoryStruct.comp f g) =
    PresheafOfModules.freeHomEquiv (CategoryTheory.CategoryStruct.comp f g)