Can't, theyre both percentage bonuses. Applied as separate multipliers, but still percentage bonuses separate from INT/base damage term (there might be a very slight skew in the percentage improvement because of the INT+5 on Chatoyant, but it wouldn't be anything drastic). The only thing that could be skewed forward is something that has a very significant amount of INT. Can't think of anything offhand, but I'm sure there's something.
Edit: Can't come up with anything in weapon slot, but I can see tons of chaos being caused by INT vs MAB modifications in literally every other gear slot.
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