If I understand you right, you have a related “addon” (one post of type “addon”) on this post through “add_on_suites” field.
If that’s correct, then you just need to check in every iteration which is the needed “addon” by adding a comparison operation like this: $related_addon_id == $addon->ID
Here is the code:
<?php
$addons = get_posts(array(
'post_type' => 'addons',
'posts_per_page' => -1
));
?>
<?php if( $addons ): $related_addon_id = get_field('add_ons_suites'); ?>
<table class="table table-hover table-sm inclusions">
<thead>
<tr>
<th colspan="2" scope="colgroup" class="text-uppercase">Product Inclusion</th>
</tr>
</thead>
<tbody>
<?php foreach( $addons as $addon ): ?>
<tr>
<td>
<a href="<?php echo get_permalink( $addon->ID ); ?>">
<i class="fas fa-chevron-right mr-1"></i><?php echo get_the_title( $addon->ID ); ?></a>
</td>
<td>
<?php if( $related_addon_id == $addon->ID ): ?><i class="fas fa-check"></i>
<?php else: ?>
<i class="fas fa-times"></i>
<?php endif; ?>
</td>
</tr>
<?php endforeach; ?>
</tbody>
</table>
<?php endif; ?>
