For what I know about the calibration differances of the 6.0 motors The H2 was more extensive in the development because GM's calibrations were different between the other 6.0 motors. The weight of the H2 makes a difference but the biggest thing was GM making it different. All of the 6.0 motors got a different calibration for 2003. The H2 was the first 03 6.0 released and the torque management was the most difficult to crack on the H2 but it has been done. If you notice they charge more for the H2 programmer from Predator but the Powerflash is about the same price. One main reason is because it is an H2.
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