Same means identical. Most of the DNA tests that I have seen, mostly the family DNA services, have errors. They are sufficient enough to match distant and close DNA relatives. But have errors and are not 100%.
Also, the goal of selecting a donor for a bone marrow transplant is to find a “perfect” match so that rejection is reduced. All I am saying is that the process was very successful in this case and the conclusions are wrong.
The true test would be that be if they tested his semen before and after the transplant. If there is a significant difference, then they can claim that his semen’s DNA “changed.” Maybe the doctors did this — my apologies, I didn’t read the article.
My twins were DNA tested to see if they were identical. They are. It’s been many years, but the within something like. 0001%,