earlier and subsequent submit of identical class on singlepost.php

I wish to present earlier and subsequent posts of identical class in wordpress

My code is :

        <?php
       $prev_post = get_previous_post();
       $next_post = get_next_post();
       ?>

       <nav class="post-nav part">
        <div class="row no-margin">
        <?php // Show the thumbnail of the earlier submit ?>
        <div class="col-xs-12 col-sm-6 prev-post" model="padding:0px">                                                 
           <?php
         $prevPost = get_previous_post();
            $prevthumbnail = get_the_post_thumbnail($prevPost->ID); 
            $post_tile=get_the_title($prevPost->ID);
            $thumb = wp_get_attachment_image_src(    
              get_post_thumbnail_id($prevPost->ID), 'full' );                                                
            ?>

            <div class="post-nav-thumb" model="background-image:  
             url('<?php echo $thumb['0'];?>')" ></div>                                  
            <div class="post-nav-content">
            <div class="post-nav-subtitle"><?php  
            previous_post_link('%hyperlink', 'Prev Put up'); ?></div>                                          
            <h2 class="post-nav-title"><span><?php     
            previous_post_link('%hyperlink', $post_tile); ?></span></h2>
            </div>

        </div>

    <?php // Show the thumbnail of the subsequent submit ?>
        <div class="col-xs-12 col-sm-6 next-post" model="padding:0px"> 
          <?php      
            $nextPost = get_next_post();
            $nextthumbnail = get_the_post_thumbnail($nextPost->ID); 
            $post_tile=get_the_title($nextPost->ID);
            $thumb = wp_get_attachment_image_src(  
            get_post_thumbnail_id($nextPost->ID), 'full' );
            ?>
            <div class="post-nav-thumb" model="background-image: 
            url('<?php echo $thumb['0'];?>')"></div>
            <div class="post-nav-content">
            <div class="post-nav-subtitle"><?php next_post_link('%hyperlink', 
            'Subsequent Put up'); ?></div>
            <h2 class="post-nav-title"><span><?php 
           next_post_link('%hyperlink', $post_tile); ?></span></h2>
            </div>

        </div>
    </div></nav>