Did the 6.2L swap flywheel weights change?

While building the SVT Cobra for the seasonal championship, it seemed the stock flywheel revs down faster than it used to. Race flywheel upgrade removes 15 pounds but only adds 2 PI. The stock engine’s Race flywheel adds 5 PI for 15 lbs.

I thought I noticed it last week in another car. The A/B of the stock and swap flywheels both removing 15 lbs but one adds 2 PI and the other adds 5 PI… can’t ignore that.