The Challenge is the track version(with some minor tune ups)of a car. The CS is the road version(Stradale comes from the word Strada which in Italics mean road) of the Challenge. The Challenge/CS are Ferrari's names. Porsche for instance uses the CS also and it means ClubSport.
Now, the N.GT with the GT is practically the same thing. There are a few differences but these are minor.
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