Clips 3 and 4 mix together very well if you start clip 3 at about 6-7 seconds, they sound like they're made to go together when mixed.
Clip 1 and 2 don't seem to mix in with 3 or 4 .. but clip 1 and 2 can ALMOST be made to work together.
It's interesting..
My thoughts so far:
Clip 1 is stand alone and probably a different song unless the others are sort of an intro.
Clip 2 seems like it's probably part of another song
Clips 3 and 4 I believe are part of the same song
I don't think these are necessarily being released in any particular order, probably just teasers without any hidden purpose..
Ultimately ... I have no clue

only part I'm fairly confident in is that 3 and 4 are part of the same tune.