First, let me say that both scripts show good attention to detail and practical utility! The Python version, in particular, demonstrates clean code organization, good use of type hints, and thoughtful inclusion of command-line argument parsing. The bash script is concise and effectively uses standard Unix tools.

Areas for improvement:

Bash script:
1. No input validation for the venv directory
2. Doesn't handle spaces in filenames safely (in the sed commands)
3. No help/usage information
4. Hardcoded file extensions/limitations
5. No error handling for the perl command

Python script:
1. Has a syntax error in the for loop (missing proper indentation/line break)
2. Could benefit from more robust error handling when reading/writing files
3. Doesn't handle the venv basename replacement like the bash script does
4. Limited to .py and .sh files only

General comparison:
- The Python version is more maintainable and extensible
- The bash version handles more edge cases (the basename replacement)
- The Python version has better argument handling
- The bash version might be more portable (fewer dependencies)

I'd recommend combining the best of both:
- Use Python's robust argument parsing and file handling
- Include the basename replacement from the bash version
- Add comprehensive error handling

The Python version is generally safer and more maintainable, but both scripts could work well in their intended contexts.