I, too, use Winmerge - and yes, one needs to be very careful when merging the files together if they are using other mods that also modify the same files.
It is also important to note that usually you will see notations that show the start and the end of the mod code and should copy those notations over as well - AND that just because you see the code once at the top of the file.... doesn't mean there is not MORE code for that mod further into the file. Using the create_account.php file for this mod - there are 3 different instances where there is code that might need to be transferred over if integrating with other mods.
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