There is a difference in the build between the Katana and the Edge/Yak. The Kata has a lot of pre-cut parts for the fuse and tail surfaces, making the chore of cutting all those sticks at different angles unnecessary. This is a really great idea, and makes building go a LOT faster. The Edge/Yak have foam core fuses, which also go together fast.

I just got my Katana kit and will be starting it this weekend.