Commentary for Avodah Zarah 78:18
התם קא בעי ליה למשקה הכא לא קא בעי ליה למשקה:
There, he needs the grapes for their liquid, whereas here [in our mishnah] they are not required for a liquid.
Daf Shevui to Avodah Zarah
The Talmud solves the difficulty by distinguishing between grapes harvested for food and grapes harvested for wine. If they are harvested for wine, then the person wants the liquid to come out of them. This makes the grapes susceptible to impurity.
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