Even just a comparion of 9K old and current bison would be interesting.
It really seems like it would be fairly easy (as these things go) to reconstruct this species assuming that good DNA can be extracted. It might be better (or worse,or just different) than what we have now.
One thing that I’ve wondered about, is that a reconstructed species might be extremely susceptible to modern diseases, because disease and the present biosphere of creatures have both evolved considerably over time in the “war” between them. If this is so, any reconstructed species like a bison or wooly mammoth or even a dinosaur might never make it out of a lab.