Centaur World is a story about a war horse that accidentally falls into Centaur World full of happy cartoon centaurs that happen to speak horse or whatever.
Neither, a centaur has a human torso starting at the base of the neck, the left one has a long neck so clearly not a human torso. The left one has a long torso, so that doesn't fit either.
Solution: it'd be exactly like a regular centaur but with a different skin pattern
We’d have to start evolution again because all mammals have four limbs, and four only. That’s why we can’t have pegasus (pegasi?) either. Bummer, I know.
The torso is a tricky concept, there's no good anatomical definition that makes sense. Is the pelvis included? The whole axial skeleton? Everyone knows the general idea of where the torso is, but it's hard to define with precision.
Giraffes are Artiodactyla like cattle so they would be closer in minotaur style than the Perissodactyla centaur style. Two hoofed legs, human upper body, long neck and giraffe head.
Speaking of Perissodactyla, this guy essentially is a fantasy creature. He's the centaur she told you not to worry about.
The right one. A centaur is a horse with a human torso replacing the horse’s neck & head. So it’s one of those humans with the long torso, you know the type.
Now do giraffe fauns. At least giraffe centaurs have those counterbalancing rear legs, giraffe fauns would need to be half as wide as they are tall to have abs strong enough to keep themselves upright. And with those tiny spindly legs they have, even if they do leg day religiously and bulk them up they'll still be teetering about on two little hooves.
A mix of both. Take the left one, make his torso just a bit taller and skinnier, and shorten the neck a fair bit. The arms need to be real lanky as well.