Cold cranking viscosity VS actual viscosity?

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What is the difference between the Cold Cranking apparent viscosity and the actual viscosity at the same temperature? For example: GC 0W-30 CC Viscosity @ -30C: 3200 cP Viscosity @ -30C: 6767 cSt Amsoil 0W-30 CC Viscosity @ -30C: 2993 cP Viscosity @ -30C: 3821 cSt The actual viscosity is close to double for the GC, yet the Cold Cranking viscosities are similar. Why is that?
 

Ferrari

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The CC viscosity #s were from Castrol and Amsoil respectively. The viscosity at -30C was calculated using the viscosity calculator here.
 
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Maybe one is "slipperier" than the other. Even though it is thicker, it flows better???
 
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The calculated Vis is Kinematic (mm2/s) @ temp °C, while the other is Cranking (mPa.s)max at temp °C. I guess my question would be how are the two related, if at all?
 
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