Contrary to popular belief, that's untrue. It is the other way around.
Marcello Gandini was the hired designer for the Cizeta. Gandini also designed the Diablo in 1988, Lamborghini first showing off the Diablo on January 21, 1990 in Monte Carlo, 1 year before the Cizeta would launch.
Now, here's where you see the connection. The Cizeta body was the original styling Gandini designed for the Diablo aka the P132 Prototype.
During this time, Chrysler owned Lamborghini and made the car less dramatic. Due to this, Gandini's design was pushed away. When Cizeta hired Gandini, he realized that he could then use his original creation after all, and thus, you get the Cizeta.
So basically, the Cizeta IS a Diablo, in the essence of the Diablo's first design. Thanks to the Cizeta, Lamborghini also had a chance to maybe get a clue of how successful the Diablo would have been had it gone Gandini's route.
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