Hello Cygnus: I'm not qualified to answer this question. To put it simply, as I understand it, a misanthrope hates humanity. A person who is schizoid tends to be reclusive & to have difficulty forming relationships. So I would say they are not the same thing.

Quite a few years ago, I was given an MMPI. The test suggested that I exhibited "schizoid ideation". Since then it has come to pass that I live pretty-much as what I typically call an urban hermit. I neither have nor want friends. So I guess the MMPI must have been at least somewhat accurate. But while I prefer to be alone I wouldn't say I hate humanity. I just prefer to keep to myself. This is my thinking on the subject, anyway.