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I can confirm that C646/C648 are exactly the same for Z0K w/ FE3 and GXP w/ FE3, and the sway bars are also identical p/n. Unless they changed something in the last month.
Front and Rear springs - I have an e-mail in on confirmation, but they are different part numbers. HOWEVER, the only difference is supposed to be in free length/load, and same linear spring rate (FE3 springs (Z0K and GXP/RedLine) (front and rear) : 170 lbs/in and 225 lbs/in).
The Z0K, when properly setup, sits about 1/2" lower than a GXP. (Putting Z0K springs on a GXP would result in a GXP that is even lower yet.)
The 'load' of the spring is not specified in 'free length' as I am used to, it is expressed in a 'check load' at a given height, which I don't exactly know.
It is not out of the realm of possibility that some of the difference felt is the difference in carrying height/center-of-gravity height between a Z0K and a GXP. Changing this changes the, 'roll gradient' and 'load transfer'.
HTH.
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