The layups are different, Nick's are multi-directional, Kyosho's are uni-directional.
The Kyosho ones were, as I understand it, designed to add traction by removing some of the deflextion evident in the plastic top deck. They went uni-directional so as to not add any lateral stiffness and thus keep the torsional flexibility of the assembly. VERY good when the grip is low as loads of forward drive without compromising side-bite / lateral grip.
Nick's, by having a multi-directional layup, not only increases traction but also reduces the torsional flex a little. This means that you still get loads of forward drive but a slightly reduced level of side bite ... we all know how much of that the Lazer FS2 has anyway!
If I had both I would run the Kyosho rear deck in low grip situations and Nick's rear deck in high grip situations. I don't believe the front section is long enough for the layup to really matter (might be proven wrong in the future) so can run either Kyosho or Nick's.
Actually having typed all that I'm thinking of getting a Kyosho rear deck to have as a tuning aid on my current Caro supplied assembly!
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