It depends on the wording of the ability, but most have been reworded to no longer stack. An example would be the Bloodsecrator's Portal of Skulls. It used to say that all Khorne units in range get +1 attack, so two 'Secrators would give +2 attacks to anything within both auras. In Blades of Khorne, it was changed to grant a buff to Khorne units (Rage of Khorne), which gives +1 the attack. Since each 'Secrator gave unit the same buff, each unit only gets +1 attack.
Did the wording of the ability change in the updated battletome? If not, the wording on the warscroll on the web store means that the ability would stack.
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