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The skulls for an Ibiesh Jackal and a common Jackal are so radically different that not only can they not possibly be the same species, they cannot even be part of the same genus or even part of the same family, and at best are only part of the same order, though most likely they share only the same class. In any case their most recent common ancestor with the common Jackal is likely several tens of millions of years ago, and the nearly identical appearance from the neck down would have to be just a very, very lucky instance of convergent evolution. Even artificial selection couldn't produce skulls of such radical structural differences within the lowest taxa. Ibiesh Jackals are, biologically speaking, about as closely related to the common Jackal as humans are with dolphins.
Now, the common Jackal and the Skirmishers are morphologically similar enough to where they could potentially be of the same genus or at least of the same family, and their most recent common ancestor could be as recent as several million years ago, but even they are almost certainly not the same species as the common Jackal. They are likely at least as closely related to each other as humans and other great apes are to each other, but no closer than how close humans were with, say, Homo erectus or Homo floresiensis.