Perhaps in the case of animations and live action it could be a valid point to figure out how much of the sound has been consciously "made" and how much of it either occurs in, naturally belongs to or is intuitively implied by the scenes. In live action you obviously have the possibility to use location sound as well as real points of reference (like life-like locations and somewhat realistic humans/creatures/objects), whereas that's never the case in animations. It's not that interesting point for the viewer, but rather important point for a sound artist. Although as these are big feature films, then they're mostly post-produced and ADRd.
I think the target group and how it's heard in the soundtrack is a good thing to analyze as well. Were the target group specified differently in some film, it might affect how the overall soundtrack is stylized.
You could perhaps find something in comparing how much off-screen and background sound gets used in live action vs animations as well. I don't know if there's any noticeable difference, but you could expect that animations could see much scarcer use of off-screen sound (perhaps to make the overall sound more plain and less life-like and more fictional and story-like or "plasticy"/highly stylized), whereas in live action there could be off-screen sound that just "has to be there" in order to make it seem more life-like or to meet some kind of convention in expectations.
Also, are there more sound cues in animations which can be left out and which don't make any sound than in live action films? Does live action automatically call for more sounds, because it has to take realism in account? How well does scarcity of sounds and a simplistic soundtrack work in live action scenes?
Is there noticeable difference in what type of sound is used to create and emphasize emotions in animations vs live action? Music, sfx, voice acting?
Finally, did you find anything that you think shows some kind of actual resemblances, conventions or differences or was your comparison random and pointless and one can't actually group and analyze films in this way, but rather there would need to be different criteria altogether or no overall criteria at all?