Why is the 60-year-old NK-12 more fuel efficient than Europrop TP400? If Wikipedia is correct the 60 years old NK-12 is more fuel efficient than the Europrop TP400, the engine for the Airbus A400M transport aircraft. 

For the NK-12MV a specific fuel consumption of 0.219 kg/kW-hr is given. 

The TP400 has a specific fuel consumption of 0.238 kg/kW-hr according to Wikipedia. 

Am I interpreting these specifications wrongly?
The source of the Specific Fuel Consumption in Wikipedia is unclear. I have found a paper (PDF) that discusses the efficiency of shaft power off-take (that is using engine power to drive systems such a electric and hydraulic generators instead of delivering propulsion). 

It mentions the TP400-D6 (which is installed on the Airbus A400M) has a SFC of 0.167 kg/(kW.h) for shaft power off-take and a SFC of 0.213 kg/(kW.h) for delivering propulsive power. This means that the TP400 is more efficient than the Wikipedia article presents and more efficient than the SFC of the NK-12 presented by Wikipedia. 

It also shows that the TP400-D6 is more efficient in delivering shaft power than in delivering propulsive power.