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There may be some weight differnce, but obviously you wont be considering both those boots. FT's original sheel is 5mm narower then the SPk, so the same foot simply cant fit in a FT and a SPK. FT do make a wider shell but it again fits very differntly to the SPK.
So if you havent allready go get your feet looked at by a bootfitter, so you at least have an idea of which boots may fit your feet.