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Same oil grades but different product, I had a look on the Elf site while back and it seems that Excellium NF and Evolution SXR are both fine to use on a clio 172/182 engine.
I dont think there is any difference as Elf say they are both "very high performance lubricants" and can be used conditions and driving styles.
I opted for Evolution SXR as this is what Renault recommend.