Don't think they're the same thing, no. They were called bath salts because that's the labels some of them were originally sold, as "not for human consumption" to avoid any regulations for human-destined drugs. That's my understanding anyway.
Ha ha ha! good answer I would've been shocked if you had said "yes". There was a girl in college named "Kate". All of us roommates called her "Hot Kate". She started taking meth and within a few short months she was no longer called "hot" Kate.... She was sort of "scary Kate".