Maud Kon on "Get custom tables from database in wp-config.php"

I want to use another Wordpress installation that gets it's tables from my original Wordpress prefix. I installed both WP installations in the same database with another prefix. I use WP Event Manager and the original prefix is like this:

wp_em_events

I want the same plugin at my new installation to automatically get it's tables from the orginal one, like the following code already does for the users at my wp-config.php:

define('CUSTOM_USER_TABLE', 'wp_users');

Is there a rule I can use at my wp-config.php file like the one that gets the users? or is there another way to get the data from the orginal table to the new one?