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EcuriePeril
ugosantalucia
Harder to say... however, spokes tend to fatigue much quicker on a rear wheel, mostly because that's the driving wheel, where the acceleration "happens" and it happens at the hub, where typically spokes fail. Front wheel spoke failures are much rarer, suggesting deceleration at the rim has very minor effects.
I suspect in a disc braked wheel deceleration at the hub will have the same effect as acceleration, this time both front and rear... actually more front than rear. So, it is not unreasonable to think that all else being equal, disc braked wheels' spokes are bound to last less and therefore the wheel needs some "overbuilding" as well as benefits from a non radial lacing pattern.