The 944 started it's life as a direct evolution of the 924, which had it's Audi engine and wasn't really considered a real Porsche.
The basic models were down to 150 hp. Then there was an S version, with upgraded engine, up to 180 or 190 and other details. Then came the Turbo and S2. The S2 is visually a Turbo lookalike, taking all the body mods from it. But it's a naturally aspired 3 liters 4 pot, not a turbo
As for a Clubsport version, there wasn't an official one afaik. I might be wrong or it could be just somebody's private idea
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