In my opinion it was the original demo for KTF but when it came to releasing the special edition they wen't back into the studio and touched up parts of those old demos and added to them and made them feel more like finished tracks.

There is an interview from VH-1 in the UK with Jon and Dave and they say that they are in the studio working on bonus tracks for the special edition of These Days. If Dave was there, then I would imagine that re-recording and adding some parts would have been done.