IF I HAVE ALREADY RECEIVED THE $457.00, THE AMOUNT ITS SAYS THAT I OWE WITH MY AMENDMENT IS $272.00. AM I TECHNICALLY JUST SENDING BACK $272.00 OF THE $457.00?

Yes, that's right. When you amend your tax return, the two results are considered separately. Just pay the amount due on the amended return. 

In other words, your correct refund was $185, so you have to return $272 of the refund you received.