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We have been tracking Google and Bing shopping visits by appending some tracking code like this '?utm_source=google&utm_medium=shopping ' at the end of all the URLs we send with our feeds. If you track like this you can segment traffic from each medium (i.e., organic, shopping, cpc).
Thanks Korgo, that is good to know. The question still remains though: If both versions of the page have the same URL and canonical tag, is it cloaking?