If you're willing to "pay" to not have to rewrite the change scripts - look into Team Suite for Database Developers. By setting up a "database project" - you can then connect to various servers, and run a schema compare, which would allow you to push the changes out.
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Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?