You are just describing determinism and it goes a lot farther than brain chemistry. The fact that we will have such exact brain chemistry was decided by billions of determining factors before even the starts that our body matter is made out of exploded.
Also yes, Twins tend to be similar, especially the clinical ones where they both come from same egg and split during multiplication. To the point where a deviation of more than 3 IQ points has a chance lower than one in a million.
But hey, dont let science get in a way of a feel good moral fingerpointing.
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