[lispm]

Racket has easily the size & complexity of Common Lisp.

https://docs.racket-lang.org/reference/index.html

I would think that it has roughly 4000 identifiers in the Racket language.

See the index: https://docs.racket-lang.org/reference/doc-index.html

Common Lisp has <1000 exported symbols in the "COMMON-LISP" package.

> when Common Lisp was being planned they needed to accomodate many features from many different Lisps before it

Common Lisp is mainly a slightly modernized & portable version of Lisp Machine Lisp, the feature influence of other Lisp dialects is not that big. The main difference is that Common Lisp provides lexical bindings and lacks a few features.