A .uz just means it's a compressed file. It's mostly useful for servers, so that downloads complete faster and save bandwidth.
Sometimes a zip will contain a normal version and a compressed version so that it's easier to setup because some people can't figure out how to, or are unable to compress them.
A mismatch means, There is a file that you have that the server has, and requires you to have in order for you to join the server at that time, which has the same name but it's contents are different (Well, this is the only case I've ever seen of it. But it's quite possible there are a few other more rare circumstances)
Usually you can fix this by deleting the file on your computer which is having a mismatch and the server will send it's version.
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