Are assets loaded additively in one scene loaded again if the next scene also contains them?

Hey folks, anybody use LoadSceneAsync w/ LoadSceneMode.Additive much? I'm wondering if a texture used (say in a GUI) in one scene needs to be loaded again if it's also used by the second scene that's being loaded Additively? Say I have a texture used as an Ad in a gui in one scene, then it's used as a billboarding sprite in a subsequent scene that's loaded additively? Or if a texture used for a couch in the first scene is reused for a chair in the second scene, would that need to be loaded additionally? Just trying to make this WebGL build load as fast as possible. =D