∀ {𝒮 : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} 𝒮] {𝒳 : CategoryTheory.BasedCategory 𝒮}
  {𝒴 : CategoryTheory.BasedCategory 𝒮} {F G : CategoryTheory.BasedFunctor 𝒳 𝒴} {α β : CategoryTheory.BasedNatTrans F G},
  α = β ↔ α.toNatTrans = β.toNatTrans