Replying to SPK Kaos v SPK Pro

Other than the obviously gnarly looks of the Pro, what is the difference between the two boots?

As far as I can tell, the answer is not a lot, except the price. I tried on the Kaos and it is sooo comfy for me! I was told that the pro would be the same fit and was drawn in by the cowboy stylee looks, but I ended up with the Kaos purely because the Pro was impossible to get hold of (only 1000 pairs made) :-(

Still pretty stoked with them...any thoughts?