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@M_V
I have both but the road one is on the bike and I was hoping someone might be able to tell me before I bother stripping my bike down.
I'm pretty sure that the spacing between the bearing cups is determined by the plastic tube spacer in the middle, the road bb has a shorter spacer so that the cups sit 68mm apart (no spacers) and the mtb ones presumably sit 73mm apart so that you use spacers (in some combination) on a 68mm shell and none on a 73mm shell or the cups might sit slightly further apart than 73mm to allow alignment on a 73mm shell too.
So my hope is that the only difference between road and mtb bottom brackets is the length of the tube spacer but it seems like it might be a case of stripping my road bb out to make sure.