In Visual Studio 2010 Ultimate there is an option called Data> Schema Compare. I was unable to compare two databases on the test server. Visual Studio generated an error message of "Schema information could not be retrieved because of the following error: InternalError: SqlCeManager could not be initialized."
I found this post with the answer: "The error message is not accurate as what the specific issue is, its actually hitting an unsupported case. SQLCE can not work against remote storage or mapped drives. It has to use a local drive for its sdf files and cache."
So I am unable to use Schema Compare because these databases are too big to copy and restore locally. Seems like a pretty big limitation to me.