Look at the blades: They're the V8 ones. It needed the bigger blades for the bigger intake/cooling requirements for the engine. The exhaust tips can be changed, but no way you'd put the smaller blades on.
/R8 geek
Having checked the specs (not being an R8 geek ) the exhuast on the silver wrapped one is a bit of a giveawy that it is a V8 as they are hardly likely to have changed the V10 tips, as on the adjacent car, to V8 tips