If you were able to identify all the genes which determine their appearance and only compare those genes from both individuals, you would probably find very similar DNA. However, there are many other genes which determine other traits which are not directly visible (bone density, blood pressure, immune system etc.), and all those genes would most likely not be similar, so the overall DNA similarity would probably also be low.
teoalcola t1_j9zxnsd wrote
Reply to Would two people who look identical but who are not related have similar matching DNA? by OhMyThiccThighs
If you were able to identify all the genes which determine their appearance and only compare those genes from both individuals, you would probably find very similar DNA. However, there are many other genes which determine other traits which are not directly visible (bone density, blood pressure, immune system etc.), and all those genes would most likely not be similar, so the overall DNA similarity would probably also be low.