Living Donor Approved by UW, waiting re Children's

Well, Israel has a few more tests to do, more time at UW, but it appears that he has been approved to be Mario's donor by his UW medical team. Meaning, he passes with regard to health/condition and ability to have the surgery. We still need to get the okay from Mario's doctors that they would "accept" his liver. I assume there are criteria Mario's Children's team might look into that would be different than Israel's UW team. Things like size, connections, appropriateness, etc. If they would "accept" his liver, we would still wait and try to get a deceased donor before Mario's health becomes worse, Israel is more of a back-up (later) option in case Mario's condition worsens before we find a donor. Sorry if this isn't straight forward...it just isn't :) I'm answering the best way I can with what we know now.