I have a set of XML files, before and after an update introducing text changes. You need to inspect the difference between these files, and then merge changes into a third XML file which uses a sligthly differnet format. This requires copying and pasting parts of the source XML changes into template fragments in the new XML structure, making edits as needed, and being very careful to be consistent and not introduce any errors. For example you could diff the files using Word, WinMerge or TortoiseGit, and edit the new XML using foxe ([url removed, login to view]). In total there are about 500 changes (meaning insertion of 500 XML segments + edits). Be very careful to avoid errors.
Attached gives an example. Please do not bid if you do not understand XML source code.