If you want to know the differences on the a/f and timing, between the datalog both tunes. Make sure the car is up to oprating temp, and datalog spark, and lambse. Lambse will be your commanded (not actual) a/f ratio. If you want to see how far your tune is off, you can also datalog kamrf which will be your correction values. If the tune is perfect, your kamrf values will be "1" but should be between 1.15 and 0.85