i'm no expert so keep that in mind but I would say the short answer is yes you could use one mold for both calibers, that's why Ruger Makes a 357/38spl Blackhawk with a spare 9mm cylinder. there are problems that can arise though.
to get the best accuracy possible you need to know what your chamber throats are running in your 38 revolver (i'm assuming that's what it is) and size your bullets to that. same goes for the bore diameter in the 9mm. (i'm assuming it's a semi auto) if the 9mm's bore is oversized or the 38's throats are under sized then you could size the bullets to the same size for both guns since they'd be really close in size to one another.
if there is a vast difference between the two then I would find a mold that threw out .359 bullets and then get two sizing dies, one for each gun. if you shoot too big a bullet for the barrel then you are going to have pressure issues and if you shoot too small a bullet for the barrel then you will have leading issues.
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