I disagree with your translation. I admit that "SBCL is Common Lisp" is a stretch, but no more than your original "Racket is Scheme". How about instead:
LISP 1.5 is like C
Common Lisp is like C++
Scheme is like Objective-C
(ignoring all the other Lisp dialects that have fallen by the wayside: Maclisp, Interlisp, ZetaLisp)