I checked the code in the repository, and this specific function doesn’t have an ID parameter, meaning that it only grabs the CF of the current post/page being displayed.
A fast solution would be:
$my_page = get_page_by_path( 'my-page' );
$meta_values = get_post_meta($my_page->ID, 'custom-field-name', true);
Maybe the plugin has another function for that, but you’d better ask in the plugin support page http://wordpress.org/tags/types?forum_id=10