Previous_post and Next_post – Custom Post Type

You want to change the in_same_term value to TRUE as follows:

 function crunchify_post_navigation(){
    ?>
    <div class="arrowNav">
        <div class="arrowLeft">
            <?php previous_post_link('%link', '&#8606;', TRUE); ?>
        </div>
        <div class="arrowRight">
            <?php next_post_link('%link', '&#8608;', TRUE); ?>
        </div>
    </div>
    <?php
    }

    add_action('wp_footer', 'crunchify_post_navigation');