Icon forged pistons

How do you figure that's apples to apples when the pin is shorter? The apples to apples comparison is the IC745 at 517/118. That's 635. Granted I don't care where the weight savings comes from but those pistons are inherently heavier no matter how you look at it.

The IC984 also is based from a slightly shorter deck of the Magnum block and if I'm not mistaken the Magnum connecting rod is narrower at the little end.