To accomplish this, determine the difference between these values and then apply an Increase for that amount to the lower value of the two attributes, and a Decrease of that amount to the higher value of the two attributes.
§ 433.1.b Core Rules PDF (officieel)
§ 433 Swap
§ 433.1 Swapping is the act of increasing one numeric value and decreasing another numeric value on some number of Game Objects such that their values are reversed.