$new_user_id = wp_insert_user(array(
        'user_login'        => $user_login,
        'user_pass'         => $user_pass,
        'user_email'        => $user_email,
        'first_name'        => $user_first,
        'last_name'         => $user_last,
        'user_registered'   => date('Y-m-d H:i:s')
    )
);
if($new_user_id) {
    add_user_meta( $new_user_id, "titulo", $current_user->title, false );
    add_user_meta( $new_user_id, "institucion", $current_user->institution, false );
    add_user_meta( $new_user_id, "direccion", $current_user->addr1, false );
    add_user_meta( $new_user_id, "ciudad", $current_user->city, false );
    add_user_meta( $new_user_id, "pais", $current_user->country, false );
}