Two wp sites using same login database

I have two wp sites, same theme, and style also using woocommmerce for sales. Just that one is in english and other in chinese.

I realized if I go to the chinese wp folder and changed the wp-config.php where the database info is to the english’s database name and login. The chinese wp will be a mess that everything is in chinese even for links and so on.

How can I setup that both of the sites are using the same customer user login?