Alright sounds like there is no tool or anything in the editor then to your knowledge. Do you know of a list of the differences, or if there is a plan to add an import tool of some sort? I feel like a lot of people would want to use that.
There were a lot of differences between the two files when I compared the defaults from a fresh install so I did not think copying would be an adequate solution.
Edit:
I found a proposal here for import/export and it seems you have already commented there :)
https://github.com/godotengine/godot-proposals/issues/5055
I think having something like this is important when the settings names and support for the features are changing between versions.