I never knew that there was a Windows 10N until you posted.
Looking it up N is for those in Europe and those programs do not get loaded with it. Windows 10, they don’t include Windows Media Player, Groove Music, Movies & TV, Voice Recorder, or Skype.
Now if you were to go from W/N to just plain Windows those extra programs will be added.
On most upgrades you can take files and folders with you but not sure if you can do it with your choices.
I would imagine you could take your files and folders with you but will leave that one to the experts to advise you.
A very interesting post and looking forward to seeing the outcome.