Power numbers means nothing on paper, unless it's supplied with the HP/Torque curve and rpm numbers.

The twin-turbo version is a fantastic engine simply because of the lack of lag from low rpm and the super low-end grunt.

The new single turbo engine may match the numbers, but if the torque peak is higher up in the rpm, or does not offer the same or more torque at lower revs, or have more lag than the twin-turbo, then the engine is not superior. Well maybe only in fuel economy.