Authors with the exact same name are given the exact same id (the authors table has a unique constraint on the authors column). So there is no difference between the two URL schemes.
You can of course run the old server if you like. As long as there are no db structural changes (which is very rare) there should be no problems. But I would be extremely surprised if you will want to. Eventually the new server will gain features like being able to edit metadata/run conversions/etc. from withtin the server, and connect the calibre GUI to a running server, so that you can use the full power of the main calibre insterface to work ona remote server, etc.
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