According to the Subaru service manuals the only difference on the cams is of course the height,
N.A is 32.364---32.464
Turbo is 32.286--32.386
dont know if that helps. it also refers to the Turbo as having "closed" heads versus "Open" for the non.
I havent found to many other difference between the two. If the bore and stroke are the same,(absolutely right Shik ) its got to be deck height or pistons, no?
Will keep looking for more info. Big manuals, small reader