Probably a refactoring-specific chart would be needed, because there are various items to compare.
At least the following ones should be mentioned:
- Rename symbol
- Extract function
- Delete unused code (e.g. unused non-exported function)
- Change scope (e.g. move to let or where)
- Add/remove function argument
- Inline definition (replace a function with its body)
- Expand TH macro (I think this was mentioned on reddit)