To use the Google Maps key for the enterprise using the Google AJAX API Loader, you simply load the shared bootloader using your key:
<script type="text/javascript" src="http://www.google.com/jsapi?key=YOURKEY&sensor=true"></script>
See: https://support.google.com/code/bin/answer.py?hl=en&answer=92831
Then you would use the URL of the Earth Enterprise alternate database to connect to the default database through the google.earth.createInstance method , e.g.
var options = { database: 'http://yourserver.com/database/' }; google.earth.createInstance('map3d', initCB, failureCB, options);
You may need to reconfigure Google Earth before instances of the Google Earth plug-in can connect to it using this method, it depends on the version of the Earth server.
Indeed, for help and support with enterprise versions of Google Earth, you must contact support. That is what is in the end.
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