Another angle in “matching a suitable womb” for a gandhabba is “paying back debt.”
I mentioned that briefly in the post: “Kamma, Debt, and Meditation”
As stated in #4 there: “Many relationships that we have in this life arise from “long-term debt” from many lives in the past. For example, people are born in the same family, same community, or same geographical locations, for many, many lives. That is for just paying back debts and for claiming old debts.”