Check if another loop showing post

Hey,

I have two loops on index:

FIRST:

<?php if ( have_posts() ) : ?>
<?php query_posts ('post_type=TYPE1' . '&showposts=10'); ?>
<?php while ( have_posts() ) : the_post(); ?>
[content]
<?php endwhile; ?>
<?php else : ?>
<?php endif; ?>

SECOND:

<?php if ( have_posts() ) : ?>
<?php query_posts ('post_type=TYPE2' . '&showposts=10'); ?>
<?php while ( have_posts() ) : the_post(); ?>
[content]
<?php endwhile; ?>
<?php else : ?>
<?php endif; ?>

I want to add third one to sidebar showing just one newest post from all post types, but i need to check if current newest post is visible on first or second loops and display older one if there is duplicate content.

Any help?