The matter is more complicated than that, I think.
The act of killing an unborn child is intrinsically and seriously evil, this is not in discussion.
But this fact is not obvious, and can be known only by recourse to somewhat philosophical arguments or by recourse to the teachings of the Catholic Church. But the latter are not easy to fully understand, and if one’s philosophy starts from incorrect premises then they may even be unreachable, and the latter are not available to anyone who does not have received the gift of Faith.
The fact that Jews are human beings is more immediate to the senses than the fact that a single-celled, brainless organism is also a human being, and hence - even if the acts are equally grave - I do not think that the moral culpability of a Nazi can be compared to the moral culpability of an abortionist.
It does not take an evil person to do an evil action. The world would be a much happier place if that were the case…