For the same reason strawberries and raspberries grown next to eachother in the same soil taste different.
They absorb nutrients at different rates and their internal chemistry turns these into different substances.
Going back to cows and sheep. They have bacteria in their stomach that help them digest food. They both have different kinds which digest food in different ways. Their stomachs are also different and their bodies as a whole are different. Like boiling or frying an egg. Same ingredients but different end results.
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