Acherus Deathcharger and Headless Horseman’s Mount

While in Stormwind I found one of the Headless Horseman’s Mounts ridden by another player on the game and so decided to get my “Alt Character” to stand next to him on her “Acherus Deathcharger” as at a glance they look very similar, however as you can see from the screenshot this is not the case at all.