Set a variable in the first loop like:
$saved_post_id = $post->ID;
Then later down the page use that variable like:
echo wp_get_attachment_url( get_post_thumbnail_id( $saved_post_id ) );
Set a variable in the first loop like:
$saved_post_id = $post->ID;
Then later down the page use that variable like:
echo wp_get_attachment_url( get_post_thumbnail_id( $saved_post_id ) );