ok so i have two iframes, one iframe has a auto refresher one doesn't, the one with a auto refresher would get the newest updates to the file and i want js to match them against each other and execute if there has been a change, they both have the same src please help me the code is below

<iframe src="messages.txt" height="100%" width="100%" id="frame"></iframe>
<iframe src="messages.txt" height="100%" width="100%" id="frame1"></iframe>
<p>

<script>
  
  var iframeContent = getElementById('frame1').contentDocument;
  
  setInterval(function () {
  
      var iframeContent1 = getElementById("frame").contentDocument;
  
      if(iframeContent1 !== iframeContent) {
  
          window.location.href= './';
      }
  }, 1000);
  </script>