I managed to figure it out myself reading around, solved it with this:
<div id="grid">
<?php $args = array(
'depth' => 0,
'child_of' => 411 );
$pages = get_pages(array('child_of'));
$grid_title = $post->post_title;
foreach($pages as $post)
{
setup_postdata($post);
$fields = get_fields();?>
<?php if($fields->company_name != "") : ?>
<!-- Any new tags will need to be added below -->
<?php if((in_array("Branding", get_field('categories')) && $grid_title == "Branding") || (in_array("Creative", get_field('categories')) && $grid_title == "Creative") || (in_array("Development", get_field('categories')) && $grid_title == "Development") || (in_array("Exhibition", get_field('categories')) && $grid_title == "Exhibition") || (in_array("Packaging", get_field('categories')) && $grid_title == "Packaging") || (in_array("Print", get_field('categories')) && $grid_title == "Print") || (in_array("SEO", get_field('categories')) && $grid_title == "SEO") || (in_array("Usability", get_field('categories')) && $grid_title == "Usability") || (in_array("Web", get_field('categories')) && $grid_title == "Web") || (in_array("Campaign", get_field('categories')) && $grid_title == "Campaign") || (in_array("Copywriting", get_field('categories')) && $grid_title == "Copywriting") || (in_array("Feasibility", get_field('categories')) && $grid_title == "Feasibility") || (in_array("Research", get_field('categories')) && $grid_title == "Research") || (in_array("Social Media", get_field('categories')) && $grid_title == "Social Media")){
echo "
<div class=\"grid-box\" onclick=\"location.href="" . get_page_link($post->ID) ."";\" style=\"cursor: pointer;\">
<div class=\"phase-1\">
<img class=\"grid-image\" src=\"" . $fields->thumb_image . "\" alt=\"" . $fields->company_name ."\" height=\"152\" width=\"210\" />
<div class=\"grid-heading\">
<h2>". $fields->company_name ."</h2>
<h3>" . implode(', ',get_field('categories')) ."</h3>
</div>
</div>
<div class=\"phase-2\">
<div class=\"grid-info\">
<h4>". $fields->project_name ."</h4>
<p>". $fields->description ."</p>
</div>
<div class=\"grid-heading-hover\">
<h2>". $fields->company_name ."</h2>
<h3>". implode(', ',get_field('categories')) ."</h3>
</div>
</div>
</div>
";
}
else {
echo " <div class=\"grid-box\" onclick=\"location.href="" . get_page_link($post->ID) ."";\" style=\"cursor: pointer;\">
<div class=\"phase-1\">
<img class=\"grid-image\" src=\"" . $fields->thumb_image . "\" alt=\"" . $fields->company_name ."\" height=\"152\" width=\"210\" />
<div class=\"grid-heading\">
<h2>". $fields->company_name ."</h2>
<h3>" . implode(', ',get_field('categories')) ."</h3>
</div>
</div>
<div class=\"phase-2\">
<div class=\"grid-info\">
<h4>". $fields->project_name ."</h4>
<p>". $fields->description ."</p>
</div>
<div class=\"grid-heading-hover\">
<h2>". $fields->company_name ."</h2>
<h3>". implode(', ',get_field('categories')) ."</h3>
</div>
</div>
</div>";
}
else : ?>
<?php endif; ?>
<?php
}
wp_reset_query();
?>
</div>