Here is a sample code of how to send data to two different Google Analytics accounts and not have it be sending twice to the same account.
<script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-XXXXXXXX-1', 'auto'); ga('send', 'pageview'); ga('create', 'UA-XXXXXXXX-2', 'auto', {'name': 'AnalyticsProperty2'}); ga('AnalyticsProperty2.send', 'pageview'); </script>