Hi David
From what I can gather it appears that in the far east each importer decides on the components that make up their saw/router etc.
Whilst externally they might look identical the different grades of component will possibly be reflected in the price.
Importer 1 might have the saw made up with components A, B, C, D, E and X. Whilst Importer 2 will use components A, B, D, F, J and Y.
Caveat Emptor springs to mind.
Cheers
Neil