PBA,
Obviously it depends on how much pigs milk or if it was put in on purpose. I think most organizations, allow up to 50% pigs milk. That’s why the CS milk is creamier and lasts longer than CY milk, the mixing of cow and pigs milk together results in a chemical reaction to the lactic acid and due to the homogenization of the milk mixture results in a different status. Once it’s homogenized, it might not halachically be considered milk and that’s why some other kashrus organizations, specifically the Chazir-K, will even allow 100% homogenized pigs milk. However, most people are noheig not like the Chazir-K.