Naruto did say they aren't ashura and Indra respectfully. Furthermore Sasuke had Indra mentality that peace could be achieved through force (his revolution plan for example), so he does fit the Indra thing. It seems to be either ashura or Indra transmigrant you need to have their mentality, and every known transmigrant had their respective mentality, either peace by love(ashura) or peace by force (Indra). In contrast to Sasuke, Itachi didn't really fit the peace by force mentality and even says you cannot do everything by yourself to Naruto I believe, so despite it Itachi probably wouldn't be a fit the Indra mentality.