Ground tach numbers never really seem to translate into much in the air.The motors may perform more evenly in flight.Torque curve has alot to do with it.Sure the Moki may have a slight advantage,but does it also not add a few ounces in weight?The person asked if there was a HUGE difference in power,and I would say no,thats all.
I have the 160 in the EF Yak,and it is not short on power (sea level)
On this clip I just changed fuel,and it is loading a bit on the low end,no lack of power though
http://media.putfile.com/Yak-54-video--3