Google analytics new tracking codes must be replaced?

Hello;

In a website that i'm reconstructing there are old google analytics tracking codes,but i see that in control panel of Google analytics there are new version of codes,do i must change the old codes with new?

The old version:
<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("UA-xxxxxxx-1");
pageTracker._trackPageview();
</script>

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Thanks
MOSTAGHASSIAsked:
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Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
Yes, change the code, but make sure to use the same id like UA-xxxxxxx-1.  GA will give you the code to replace.
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MOSTAGHASSIAuthor Commented:
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