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Rs1600i is different as its a solid profile. But xr3i and rsturbo are exactly the same. The standard cam pulleys are different tho. The RST pulley has a few degrees advance or retard(cant remember which)
Ah your right there the EFi cams were made from a differnet material (at least this is what i was told by Ford) but..... the profile is still the same!
So to really answer the question.... yes you can use your XR3i cam in your RS turbo Butchi