The only “exact” match would be from an identical twin.
How precise was the post operation DNA test. “Within the margin of error?”
Post birth influnences of nature cause identical twins DNA to derivate to some very minor degree... but still very close.
I am an identical twin... Outside of always having a close/best friend since birth... we tend to have the same physical ailments.
So when one of us has a condition, the other will make an appointment to be looked at.
For example, I have spots on my lungs. My twin went to be looked at as well... turns out he has the same condition. They are non-cancerous and probably from an infection we were both exposed to.
We are each other’s canary in a coal mine when it come to any genetic abnormalities.
Cool.