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Prestashop 1.7.7

To use different E-Mail Templates by Group, Carrier, User, or what ever:
Use the Hook sendMailAlterTemplateVars in your Module... 
Dont forget to create the templates in /themes/xxxx/mails/xx/order_confsomethingother.html

$this->registerHook('actionEmailSendBefore');

public function hookActionEmailSendBefore(&$params) {
		
 
	if($params["template"] == "order_conf") { # or bankwire or ,.....
		
		

		$reference = $params['templateVars']['{order_name}'];
		$sql = 'SELECT * FROM '._DB_PREFIX_.'orders WHERE reference = "'.$reference.'" Limit 1 ';
		$orderRow = Db::getInstance()->executeS($sql);
		
	   
		if (!empty($orderRow)) { 
		
			$id_order = reset($orderRow)['id_order'];
			$order = new Order ($id_order);
			
			if($order->id_carrier == "36") {
				$params['template'] = "order_confsomethingother";
			}
			
			/*
			For User Groups you can use something like this:
			$customer = new Customer ($order->id_customer);
			if($customer->id_group == "36") {
				$params['template'] = "order_confsomethingother2222";
			} 
			*/
		}
		
		# do something more...
		if (is_array($params['bcc']))
		{
			$params['bcc'][] = "[email protected]";
		}			
		else
		{
			$params['bcc'] = ["[email protected]"];
		}
	}
}

If you want to add variables, use: sendMailAlterTemplateVars