Problems moving site to another domain

If might have been easier to leave all the files etc. in place and simply change the Domain Name Server settings from abc.net to abc.com. The all you need to do is change $config['base_url'] and you would most likely be up and running. You would have to look closely for any hardcoded URLs to the full .net domain. (Which best practices would not have allowed.)

Obviously, you would need to replace the SSL certificates for .net in the server with the ones for .com.

This approach assumes you don't care about the .net domain any more.

But otherwise, I cannot think of what else would need changing.