The result is not the same either. The described infanticide serves a goal of undoing other gene’s reproduction. Abortion is a smarter form of not spending resources on a weak/dead-end offspring (or just throwing it out of nest), if you want these analogies.

Would you condone the post-birth infanticide of a weak/dead-end offspring as a smarter form of not spending resource someone probably does not have ?

I’m not talking morals here and not arguing for or against abortion. Our morals have nothing to do with competition infanticide in mammals vs abortion diff.