If you are using phpMyAdmin, you can export selected records. Run a Search query for the stuff you know you changed, select only your records, and at the bottom is an export selected option. Puts it into a nice text-shaped .sql file.
If you are not using the web-based admin tool, there should be a similar way to export a recordset, one would think. If not, and you have php, I recommend the simplicity of phpMyAdmin 2.81 or whatever they are on.
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