Some examples I noticed:
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Hot Cheetos, in Europe they're far less spicy and taste almost sweet like ketchup.
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Takis, in Europe they're less spicy but are slightly more similar to the original flavor than Hot Cheetos
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Sour Skittles, in Europe they're far less sour- mostly I think because of the lack of the acidic powder.
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Pizza chains, most fastfood chains are at least vaguely similar, this is not the case for any foreign pizza chain which has a completely different menu. European pizza hut tastes like vomit :c