The analogy breaks down in quite a few places. In addition to the ones you mentioned, there are no multiple implementations of Racket. That said, there is a si

The analogy breaks down in quite a few places. In addition to the ones you mentioned, there are no multiple implementations of Racket. That said, there is a similarity (and contrast) with CL in that, as a relative novice, there is enough of a cohesive system that I can imagine writing software in Racket. With other schemes, I've had the distinct feeling of starting from ground zero. Outside Racket, Chicken comes the closest, but is still a long ways off. Take my comments with a grain of salt; I'm a neophyte who has pretty minimal experience writing any dialect of lisp.