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Mal said it all.
I discovered I was allergic to only certain sunscreens. I tried all that I could until I found one that wasn't causing me hives. Then I looked at the ingredients and found one that was common with all that caused me hives but not in the one that did not cause me hives.
Start by comparing the two drinks. Look for what is common between them and that MIGHT narrow it down a tad to the things that could be possible allergens. Then test it out with some different brands with different ingredients but keep the benedryl handy (but don't take before hand cause you might end up not getting the hives if you take the antihistamine prior to drinking the allergen. Also keep a friend close by in case of an emergency. With many allergies (esp food allergies) a reaction such as hives can escalate without warning to an anaphlactic reaction.
Even better if you can afford it go to an allergist and tell them your suspicion. They can possibly test you for allergies to the specific ingredients in those drinks.
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"Always learn the rules so that you can break them properly." Dalai Lama
My Karma just ran over your Dogma. 
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