Full singel post

Yes, you can do something like this

<?php 
$loop = new WP_Query(array ('post_type' => 'carousel', 'orderby' => 'post_id', 'order' => 'ASC')); ?>
<?php 
while( $loop->have_posts() ): $loop->the_post();
$current_id = get_the_ID();
?>
    <div class="bbbb">
        <div class="aaaa">
            <h3><?php the_title(); ?></h3>
            <?php 
            if($current_id == 12){
                the_content();
            }else{
                the_excerpt();
            }
            ?>
        </div>
    </div>
<?php endwhile; wp_reset_query();?>
</div>

2nd way

echo both content and expect in separate div and call post id in each div, hide add content div except what you want to show