As a person who has briefly interacted with both on different occasions, I don't think they're the same person, and I didn't notice big similarities with the typing style other than internet slangs and copious use of smiling emotes, both of which I am also guilty of.

mrunicorns definitely irks me though, specially with the flipping and what the other person said about him offering 10g for an g1 XXY as if everything else mentioned wasn't bad enough already.