 But difference (διαφορὰ) and otherness (ἐτερότης) are distinct (ἄλλο). For, while the other and that which it is other than are not necessarily other in something (for everything that is some being is either other or the same), the different differs from something in something, so that it’s necessary for there to be something the same in which they differ. This same thing is a kind or form; for every different thing differs either {i} in kind or {ii} in form [...]. (1054b22–31 cf.  1018a9–15; translation quoted from Salmieri 2008, 79) 