Copy/paste of code might have saved my team some work. We had 2 versions of the same tool built by a third party like 10 years ago that works within a major app

Copy/paste of code might have saved my team some work. We had 2 versions of the same tool built by a third party like 10 years ago that works within a major application the business uses heavily. One version of this tool had been rebuilt with a 64-bit version. The other has ceased working at all on Windows 10 which we are deploying to all users on new computers. They are functionally the same tool beyond one config file setting defaults and another config file managing access to components of the tool. After playing with the differences, we iced the broken app and updated the setup KB with the config differences. As we upgrade the core app that the vendor tools work within, we are glad this headache had a quick fix but is being cut as the new version of the application natively supports what the tool did in the old version. That being said, don't use this as a reason for doing that or at least document that for the future owners of the tool so we don't waste what little time we have troubleshooting functionally identical software.