The monk's AC Bonus ability states, "When unarmored and unencumbered, the monk adds his Wisdom bonus (if any) to his AC and his CMD."
The scaled fist archetype states, "Any of the scaled fist’s class abilities that make calculations based on their Wisdom (including bonus feats with DCs or uses per day, such as Stunning Fist, but not Wisdom-based skills or Will saving throws) are instead based on their Charisma." Therefore, the monk's AC Bonus ability adds their Charisma modifier (if any) to AC instead of Wisdom.
A Nature Oracle's Nature's Mysteries ability states, "You may add your Charisma modifier, instead of your Dexterity modifier, to your Armor Class and CMD."
My question is, does the Nature's Whispers ability stack with the Scaled Fist monk's AC Bonus ability and provide Charisma to AC twice, once as another form of the bonus from Dexterity and once as a bonus from an ability, or do they count as the same kind of bonus and only one can be used?