Which isn't much of a shock given how many times that region was invaded and received new populations over the centuries since that mummy died.
Impossible. The only human beings with identical DNA are twins (or clones, but we aren't there, yet). They could have the same genetic markers showing they are part of the same population, but not the exact same DNA.
And even that makes no sense genetically, because human populations have shifted and mixed so much, even within historic times, that few people alive today would have identical markers to their own ancestors. And with globalization allowing even more mixing of different gene pools, that will only get more complex. Consider my son who has DNA from European ancestors on my side and Chinese ancestors on his mother's, then consider the mixing and matching that happened in both those regions over the millenia.