system
Given the following post, respond as if you're commenting on Reddit:
human
[General] Are zombies created by science different from those created by magic?

In most modern zombie media the apocalypse begins with a disease/virus that was created by science. That disease is link to the brain that’s why there’s a “shoot them in the head” rule. 

But does that rule still apply when the zombies are created through something like necromancy? Is their head still the prime weakness or do they need to receive a certain amount of bodily damage before dying (for real) ?
gpt
This question is a bit too broad to answer definitely, since there are many different disciplines of "science" and "magic", and consequently there are just as many different varieties of zombies.  But since there are differences between these zombie varieties, the short answer is that yes, there can be differences between zombies created by science and zombies created by magic, but there is no neat delineation between the properties of science zombies and the properties of magic zombies.  

Let's first note that not all science zombies are killed by shots to the head.  Corpses reanimated by telekinesis, for example, will not go down until you destroy the body to the point where there's nothing to move telekinetically.  Zombies created through technological implants or nanomachines (eg. husks from the Mass Effect universe) also do not necessarily show particular weaknesses to headshots.  

As for zombies animated by magic, as mentioned there are far too many types of such zombies to come up with any unified rules for how to kill them.  Some zombies are basically just the same person magically given a second HP bar after death, and if you cause enough damage then the person will fall down dead again.  On the other hand, some zombies will continue "living" no matter what you do to them, until their creator is killed or the undeath spell is stopped.  Many zombies will likely fall somewhere in between these two extremes, where you can kill them just by doing enough damage to them, or by killing their creator or stopping the spell.  

Furthermore, an additional difficulty associated with answering this question is that the definition of a "zombie" is a bit murky.  At its most basic, a zombie is a reanimated corpse.  So if a skeleton is magically reanimated, is it a zombie?  How do you kill a magic skeleton?  And if we agree that skeletons can be zombies, then what about other reanimated body parts?  The Thing from the Addams Family universe is a reanimated severed hand.  Is that a zombie?  How do you kill the Thing?  And in the Dwarf Fortress universe, *all* body parts can be reanimated by magic; in addition to reanimated bones, you can also have reanimated skin, hair, animal shells, etc.  They can only be killed by bashing them into a pulp so that there's nothing left to reanimate.  Cutting them in half with an edged weapon won't work, you'll just get two smaller pieces of skin reanimating again and coming after you.  

Anyway, all of this is to say that yes, there are differences, but that's because all zombies are different.