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The difference in the boots is the last, the SPK are almost 1 cm wider than FT, i got fitted for full tilts, dalbello, ghost and spk. The FT, Dalbello, and Ghost fit me since they are similar last, the SPK was too wide for my foot, it was comfy but not what you want in a boot.
Get all dialed in with a good boot fitter. Those are two totally different fitting boots.