I mean I always used to think that they are the same, but then again, it appears that madara absorbed the shinjuu and neither hagoromo nor juubito absorbed it coz if they did, they will be immortal and they will have rinnesharingan, madara after absorbing it became immortal and awakened the rinnesharingan, so I'm kinda confused as what the difference is,for people who think it was in juubitos body I dont really think so because juubito summoned it like madara summons kurama (and we all know madara is no kurama jin but he can summon it at will but unlike naruto who is its jin and can use kurama's powers) so juubito did the same, so basically juubito has'nt merged with, so a lil help to clarify this please