There doesn't seem to be much about "donor matching" in the article. Obviously, you don't want outright defective mitochondria used. HOWEVER, it also seems to me that the mitochondrial genome works in conjunction with the nuclear genome (especially since most mitochondrial genes have, over the millennia, migrated to the nucleus), and that matching between the two is relevant. In fact, there are prominent theorists who believe part of the reason we have mitochondria passed mainly from only one parent is to make sure of a mitochondria-nuclear genome match (at least, for half of the genome), and that this match is so critical that it helps to explain why females, who start off with several million potential eggs, wind up with a "top 200" for their reproductive lives.
What work has been done on this?