The same reason you can build different things with the same set of LEGO blocks.
The food just provides the building blocks, the vast majority of what food provides is simply the glucose to convert into energy and tissues, most vitamins and minerals just aid these processes. The DNA and genome is what lays out how these building blocks are put together.
Just imagine that cows and sheep both ship with the same set of LEGO blocks, but they have different instructions to put them together.
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