Thanks for the motivation to look this up! It appears that stem cells are matched to the recipient with HLA, a protein "marker" indicating whether it belongs in your body or not.
https://www.dkms.de/en/content/does-donor-have-have-same-blood-type-patient
Enjoy!
It is useful information thank you, and the transfer of members from one person to another, requires a complex consensus C M H @libertyteeth