The Importance of a Code of Ethics for Engineers

Visit following web sites:
1. NSPE Code of Ethics : https://www.nspe.org/resources/ethics/code-ethics
2. ASCE Code of Ethics : https://www.asce.org/career-growth/ethics/code-of-ethics
3. IEEE Code of Ethics : www.ieee.org/about/corporate/governance/p7-8.html
4. ASME Code of Ethics : https://www.asme.org/wwwasmeorg/media/resourcefiles/aboutasme/get%20involved/advocacy/policy-publications/p-15-7-ethics.pdf
Why do engineers follow a code of ethics?
Choose any two codes (for example NSPE code of ethics and ASCE code of ethics) and identify what do these two codes of ethics have in common? Do they differ anywhere?