One has more springs. 
The stock 914 doesn't make enough power to really necessitate the 6-spring clutch. The extra springs just make the center area more robust, but it's not really necessary for the stock engine.
Aaron
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Silver 1998 Volvo S70 T5 <- Daily (Anja)
Guards Red 1986 951 <- Seattle car (Gretchen)
White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei)
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