Commentary for Avodah Zarah 131:7
חלא דחמרא וחלא דשיכרא וחמירא דחיטי וחמירא דשערי אביי אמר בנותן טעם בתר טעמא אזלינן והאי טעמא לחוד והאי טעמא לחוד והוה ליה מין בשאינו מינו ומין בשאינו מינו בנותן טעם
If wine vinegar [becomes mixed] with wheat vinegar or wheat yeast with barley yeast, Abaye said: [The mixture is prohibited when the prohibited substance] imparts a flavor. For we use the criterion of taste and since each has a separate taste, it is a case of one species [being mixed] with a different species, and in such circumstances the mixture is prohibited only if the [prohibited substance] imparts taste.
Daf Shevui to Avodah Zarah
Wine and grain vinegar have the same name but different flavors, as do wheat and barley yeast. To Abaye these are different species because categorization is done by taste not name. Therefore the prohibition is prohibited only if the forbidden substance imparts taste.
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