Just my take
1-NLOTH
a-there was the 3:43 clip which I did about everything I could do to clean up but it just wasn't going to happen. I can tell you what I think though. There is a harmony bit that sounds something like "There is no..." which also resembles the chanting "Oh-oh's" in clip1. This song also sounds like it has a different root key, although to argue this point would be precarious. However, the two similar harmonies are both sung in D, which gives the impression, especially if you are just listening to the clip as is, with the naked ear, that they are the same. If you listen to the structure of the song, they don't match.
NLOTH was also described as having heavy distortion guitars and a mellow title refrain. This was from a Jan 2008 article and the 'beach clip' 3:43 was recorded and leaked in Feb. This description seems to match the 3:43 clip, besides hearing 'No Line On The HOrizon' in the clip itself, I think it's a working song at that point. Lots of Bonogolese screaming (to me at least).
2-The Lanois Chant song
Appeared a good 8 months prior to the article and the leak, in the Lanois movie. Based on the comparisons of the Lanois film clip and song1, not only are these the same song, the backbone of this melodic section did not change. So, the NLOTH 3:43 clip, without this section, has no other real connnection to this song but.....
3-The solo
The Chant Song is older and seems to have remained unchanged in the 'chorus' bit (besides any unknown lyric changes). The 3:43 NLOTH in my opinion is a 'working song' or demo. The solo arrived out of those jams. It ended up not working in NLOTH.
They lifted the solo from the NLOTH "demos" and put it in the older Chant song's outro.
I don't know why on earth they would be playing two songs at once, that seems to make little sense to me. I've maintained all along that the harmony in the 3:43 NLOTH clip was devious in that if you weren't trying to compare the audio side by side (as I have) you could easily mistake them but the simple fact is, they don't match.
So, to propose that this song is NLOTH, you'd have to assume that they went from the melodic chant in the Lanois film (Summer 2007), then months later proceeded to add heavy guitars to it, and the melodic title refrain of NLOTH, only to back out and revert back to something closer to the film version and drop the heavy guitars and mellow title refrain altogether.
Or you could propose they went from that Feb 2008 3:43 of NLOTH to breaking them into two seperate songs altogether. Any of these two latter possibilities suggest that they would have scrapped elements of the original Lanois chant, which doesn't seem likely.
Or just simplify it. They liked the solo that was born out of working on NLOTH, decided to take NLOTH in a different direction and kept the solo and dropped it in the outro to the chant song. Two different songs, IMO.
Actually, it wouldn't surprise me if the first line of this song is "It's six o'clock"