Moray:
"Yes, and NO. One is a distinct subspecies, and cannot interbreed with the other, from a divergence in genes about 10,000 years old. There are cetacean biologists still attempting to get them into different species classifications, for almost 30 years now. Neither types mix, one eats fish, the other marine mammals. One live offshore, the other in coastal waters. Even their echolocation is different. But, they look pretty much identical on the outside."
That means that those two are less related than a horse and a Donkey. Of course those are the same species, right
Anyway, the way nature wants things to be, may not mean to...cosy.
Neither is nature responding to drastic changes due to the works of one of natures species. So play it gently.....