Well, of course. Rust is not designed around immutable data structures. There are going to be differences because it's simply not the same language. This [0] example, written by a notable Haskeller, illustrates what I mean pretty well and also touches on what you just pointed out. It's also very consistent with my own experience.

[0]: https://donsbot.wordpress.com/2020/07/04/back-to-old-tricks-...