Hollowtech 2 Road BB on MTB ?

Can you fit 68mm Road BB on an MTB if you use the existing spacers from your old MTB BB ?
MTB =68/73mm(SLX) , road = 68mm (Ultegra).
I have Deore Crankset FC M590
MTB =68/73mm(SLX) , road = 68mm (Ultegra).
I have Deore Crankset FC M590
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Parktools :?:SheldonBrown