I created the edu email but my friend purchases the .edu email from a seller. What is the difference between them?
No there is no difference between such accounts. The seller also creates an account like the method we mentioned above. You can get different scripts online for mass creating the Edu email or you can create your own scripts to create a mass account using python. (which we strongly discourage because it will spam the method and the university will stop providing the emails.)
If you don't have many times for creating emails and want many emails then we have you covered. We have mentioned the shop link at the top of this article. You can purchase the edu emails from that link.