Abortion for Non-Jews
Question
I'm 99% sure I was told by an Orthodox rabbi that abortion is the one transgression which is stricter on goyim than on Jews, that it was murder for goyim but even an unpermitted abortion was not murder for Jews. But I can't figure out what would be different for them. If it's murder for them, how could it not be murder for us? OR, if it's not murder for us, what could possibly make it murder for them? Are goyish embryos different, more developed, more something than Jewish ones?
And who is liable for punishment for an unpermitted abortion, the doctor, the mother, both?
For the record, this is an academic question. I don't know anyone who is pregnant and there is no chance I will make someone pregnant. But it would help to understand this if I want to know where I stand in the USA national abortion discussion.