@alyssa I actually need to finish a paper on this subject after work 😅 Once I've got my notes together I can go into as much detail would please.
But the short version is that academic literature considers therianthropes as a subset of otherkin. One commonality I have noticed among therian subjects is a large amount of emphasis on somatic experience and phantom limb sensations are present, as opposed to more anthropomorphic forms of otherkin.