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.
Sheep and cows do not eat the same things. Cows are generally selective grazers (so only really eat grass) but sheep will eat anything that’s green and some stuff that isn’t. But maybe they are all brought up in barns and fed only soy now so ¯_(ツ)_/¯
Edit: brackets
Edit 2: Reddit is stupid and all I wanted was a shrug
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