From: https://eventespresso.com/topic/login-options-between-wordpress-users-and-event-espresso-4/

disable_email_match.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file
//* Disable email match check for logged out users

add_filter( 'EED_WP_Users_SPCO__verify_user_access__perform_email_user_match_check', 'ee_wp_users_remove_email_user_match_check_logged_out' );

function ee_wp_users_remove_email_user_match_check_logged_out() {
    if ( ! is_user_logged_in() ) {
        return false;        
    } else {
        return true;
    }
}

disable_email_match_everyone.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file
//* Disable email match check for all users
add_filter( 'EED_WP_Users_SPCO__verify_user_access__perform_email_user_match_check', '__return_false' );