Theres no way you could mistake the 2.0 petrol for a diesel when they are idling. The diesel has far more clatter.
I have heard though that the valvetronic causes that tappety tappety sound which is probably what you are hearing.
Although from the magazine reviews I have read and my own (admittedly brief) test drive of the 320i, the new iteration of this engine is the most 6-cylinder sounding 4 cylinder on the market.
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