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What are the difference between the internal anatomy of a pig and human?
Outside of hoofs instead of hands & feet, and the proportions needed to be a quadruped, almost none. And when cooked, we & they smell alike (ask any fireman who has just given up pork for a year or two.)
There's an entire college course devoted to this (well, it does include other animals also) called Comparative Anatomy. One of the more significant differences, of course, is that pigs are quadrupeds...