Most likely.
Best thing to do is make backups of your custom stuff then source them in after a fresh database install. Always, always, always have backups. Even if it was a small sql modification, it's just so much easier to adapt it to any database once you've got it installed.
Although I love George's tools, basic SQL knowledge is a must for cases like these as it makes your life so much easier in the long run. Just learn basic insert and replace functions for MYSQL and you should be good to go. Make sure you're not overwriting existing data either, or it can get ugly.
Good luck.
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