Right I see what you mean there. I just thought you were joking about the fact that so many songs do sound the same and that you started to tread it as a little game, just to have fun with.
As for that thread, I do not know that one, must be posted on the songwriting forum I guess.
In a way it is not that hard to have the same chordprogression and let them all come out as different versions [or songs]. change the feel a little and it already makes a huge world of difference. You know the attempts Led Zep made at reggea? Well does it sound like reggea? Not really, but it does have a totally different feel compared to their more "Rocky or Folky" stuff. I know someone will get me on this one now here, and perhaps we should not go into this here at all as it is a totally different subject.
Eddie