Magic itself is normally defined as a super natural force, ie not natural, ie not real. You can't have something that is by definition 'not real' be 'more real' than another form of it. You have magic realism, high fantasy, low fantasy and a dozen other genres like Sword and Sorcery. All of them are, for all intents and purposes, fictional. Even if one is a perfect alternate Earth, that doesn't inherently make it 'less fictional'.