Could you please explain what the difference between having a synpath and being otherhearted/fictionhearted is? I’m confused about what the difference is and haven’t been able to find much information on it anywhere.

A synpath is something/someone that you identify with/have empathy with/for. (link)  (link)

otherhearted/fictionhearted is having a strong emotional/spiritual connection with someone/something without actually *being* them. (link) (link)