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Shimano MTB BBs use one 2.5mm spacer (or smaller ones to make that up) NDS on a 73mm shell or two NDS and one DS on a 68mm shell
Isnt it the other way round. 68mm; 1 x NDS & 2 x DS. 73mm 1 x DS. Also MTB cups are 10mm wide as opposed to road which are 11mm so a road chainset fitted to an MTB BB will be 2mm too wide, so spacers needed if cant take up difference using the preload nut.
velosaurus
snottyotter
Main difference between BBs is the plastic spacer between the cups because you don't use a spacers over the threads, I've had to use a couple of MTB ones and reuse an old road center spacer recently because of difficulty getting stock. MTB cranks have a longer axle, which if the raceface one used spacers is probably the case there too, but worth checking, Shimano MTB BBs use one 2.5mm spacer (or smaller ones to make that up) NDS on a 73mm shell or two NDS and one DS on a 68mm shell, ignoring all the ones for wider shelled boost etc stuff or BB fitting mechs or chain devices.