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@user8746
Have you got both on you? Measure them and see if they're the same. The internal spacer is just a spacer so you should just be able to swap them. The crucial length is the distance between the outside of the bb shell (so where the thread meets the shoulder on the bb cup) and the crank arm (so where the sleeve on the inside the bearing ends). If these match then you should be ok. The mtb bb may be wider, so the axle on your road cranks may not be long enough.
You follow? I spent ages trying to work out if a hope bb could be used on my gxp cranks, but they're different again.