Custom admin email for new user registration

Yes, you can Change email address by using wp_mail function.
You can check this how to do this
http://www.butlerblog.com/2011/07/14/changing-the-wp_mail-from-address-with-a-plugin/

Use this plugin for user management it supports email address when new user registers
https://wordpress.org/plugins/wp-members/

Use this code in your functions.php file.

function so174837_registration_email_alert( $user_id ) {
    $user    = get_userdata( $user_id );
    $email   = $user->user_email;
    $message = $email . ' has registered to your website.';
    wp_mail( '[email protected]', 'New User registration', $message );
}
add_action('user_register', 'so174837_registration_email_alert');