After reading the EK Bio prep book I read no mention of any of these terms (except natural selection, of course), unless they were called by a different name. If they're not synonyms of things I've read before, I wouldn't worry too much about it. Kin and group selection aren't K- and r-selection, are they?
That said, I'd still encourage you to find the answer if you can. It certainly won't hurt you. Just don't worry too much about it cause I suspect it won't be found on the MCAT without an explanation.