Not sure about springs, the marking isn't a renault part number so probably aftermarket.
Those KYB rear shocks are not right for any RS clio, let alone a cup. The KYB excel-G is supposed to be an improvement over OE quality, but the part listed for mark 2 clio's covers all varients except Renaultsports (they are too soft)
They also sell an even more "upgraded" rear shock called Gas-adjust (more KYB marketting b/s) and even they were not firm enough to be a suitable alternative to genuine renault shocks, so I've found.
Hope that helps a bit.