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Richard - the FIA says the compounds are the same and it was reported here on crash.net in the story "FIA confirms Silverstone test rules" on 10 July 2013. The FIA statement read - “Only the 2012 construction will be used for the test but with the hard, medium and soft 2013 compounds." I didn't say they weren't different, I said the grip would be comparable as the 2013 compounds are being used. The compound largely dictates the level of grip, that's why there is a hard, medium, soft and supersoft compound on one type of construction.
Pirelli are testing these tyres because they're using the 2012 construction to try and stop them blowing up as they did at the British GP.