Google Earth Enterprise is intended for organizations that have large geospatial data stores. Google Earth Pro offers an enterprise wide installation method appropriate for this situation where an entire organization wants access to Google Earth on the Internet,
Google Earth Enterprise is designed to run on your own hosting environment on your own servers

Google Earth Enterprise Technical Details

Google Earth Enterprise takes the same processing and serving infrastructure that's used at Google to build and serve Google Earth and Google Maps to millions of users and brings it to your organization's data, allowing rapid, secure viewing and use by your users. Web-based mapping mashups can be easily built with your data through Google Earth Enterprise and data is securely viewable and accessible through the Google Earth Enterprise client or through a browser using the Google Earth or Maps API.