The original data files are at
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(pick Show All, get server-1.0-4.0-data.7z, then I forgot the exact name in that but 3.4 has "welink" or something like that in it).
Most of the cheat changes will be in the txt files, but a few can be in json and lua files too. I've only used 3.2 since I don't trust the 3.4 VM so don't know details, but some parts won't be a simple file replacement. The original 3.4 files are missing things so that would break characters and probably more. Something like the free trial of
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can help a lot with finding and editing all the changes (and won't break the txt files like some text editors might by default by doing things like removing trailing whitespace).