But note that just because a model says it's using chain-of-thought or tools to come to a certain conclusion, doesn't necessarily mean that it is: https://vgel.me/posts/tools-not-needed/
Therefore deciding whether they are interchangeable is a deep question that may take centuries to resolve.
This has been illuminating: as ChatGPT steps through the lines of code, its "analysis" discusses material that _is not present in the line of code_. It then reaches a "conclusion" that is either correct or incorrect, but having no real relationship to the actual code.