Is it possible to migrate a wordpress website to another wordpress account?

I have a website I developed on my own wordpress account and localhost. I uploaded this website on my clients hosting account using FTP. After uploading from localhost to live server, I am unable to login to wordpress using client’s credentials it simply shows unknown username whereas when I log in using my credentials it shows my wordpress admin dashboard. I want to transfer my website frommy account to clients wordpress account. How do I do it? I’m relatively new to wordpress so sorry if it seems like a trivial question!