Destiny Dice: "The result of the roll you would have made is replaced with the value on the Destiny Dice you spent."
Kairos: "...you can replace a single dice from one of the following dice rolls with a result of your choice."
Emphasis mine. The number of dice being replaced is different between the two abilities, as is the number ON those dice. But both rules specifically refer to a result being replaced.
Additionally, both rules say to treat the result as unmodified (and cannot be modified further). Compare to the LoC where his ability to change results after they are rolled counts as a modifier.
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