i'm interested to know what facts you base this on as they run the same engine?
If you look about you will see that imports usually have a few more bhp when dynoed and remapped. I think because they are used to running on 100ron.
Also the import has more charecter, square rear plate, square front plate. Folding side mirrors, dipping side mirrors on reverse. Some stuff in the engine that arent there on uk engines. The writings also in japanese so it looks much cooler. JDM for the win.