category / listing.php override

-- HikaShop version -- :2.2
I have created an override for the category / listing.php page, however, I don't want it to apply to every product category. Is the a way to apply the override to a specific category or categories?

You can add checks on the current category in the file like that:
if($this->element->category_id==18){
//display for the listing with the current category being the 18
}else{
//display for others
}

so I would need to add this for each specific category, correct?

yes