Full disclosure: i don't think the debate is on these grounds, i think the violinist or the seed-people are better ways to think about abortion right now (and at least until unwanted children are completely taken care of by the society and not the mother, and until a pregnancy gives you a white year/have no influence on your career prospects).
But I did some research last year about consciousness in animals (i was always a functionalist, Chamets made me an illusionnist, i wanted to understand what it meant for animals and for AI). I was quite shocked to learn that a baby in his first weeks had a worse sense than any newborn mammal, and than most birds.
What does that mean? For functionalists (probably GP is one), going full moral utilitarist, killing a litter (to avoid getting overwhelmed by kittens) is probably ten time worse than killing a three weeks old baby. Luckily, while i think utilitarist moral intuitions are probably the most accurate, I'm not fully utilitarist, and this kind of intuition repulse me.
All of this to say that thinking logically, being pro-life to avoid 'murder' should push people to go full vegan (or eating only insects and seafood), and aborting a cat or killing a litter should be prosecuted as well.