There is no difference, but I think in this case because it takes solid bit of power to hold onto the bars while the whole bike is just swapping around and doing as it pleases for these 9 death bumps, so the power goes in front. dunno, maybe Bryce knows
I can see where adamdigby is coming from. Putting an adjective infront of a manual is a very serious matter. Power manual is a totally new way to lift your front tire off the ground