This has me confused, would another way to put it be...........Compression height is the measurement from the center of the wrist pin to the top edge of the piston?
Since we're talking in thousandths of an inch, I prefer to use the pin hole as a reference. Less variation. Besides, that's where the measurement is taken from for the spec. The pin is irrelevant. besides that, the pins are not a press fit into the piston and have clearance between the pin and pin bore in the piston. That might be splittin hairs, but accurate is accurate.