Yes, they are. Slim is thinner overall--body given to the Michael Jacksons and Sweeney Todd.
I just picked up a Sweeney Todd body the other day. I'll have both, so maybe I'll just see how they look with Rainman's stuff when I get it in-hand.
Rainman's Bill outfit might fit too loosely on the body, but I re-watched the movie the other day and he looks insanely skinny in it.