No. It's more complex than that.
You also need to add some code in the onAfterOrderConfirm function of the migsvpc.php file:
$currencyClass = hikashop_get('class.currency');
$this->amount = $currencyClass->format($order->order_full_price, $order->order_currency_id);
$this->order_number = $order->order_number;
and then you can copy the code
<?php echo JText::_('ORDER_IS_COMPLETE').'<br/>'.
JText::sprintf('AMOUNT_COLLECTED_ON_DELIVERY',$this->amount,$this->order_number).'<br/>'.
JText::_('THANK_YOU_FOR_PURCHASE');?>
from the collectondelivery_end.php file to the thankyou file of the migsvpc plugin and you'll get the same message displayed for it.