Are the kett and angara actually the same species?

Looking at some new, close-up images of a kett soldier, I've noticed some similarities between the kett and the angara.








So look closely and you can see that under the bony exoskeleton, the kett has very similar facial features to Jaal. They have the same shape face/head, same nose, the same wrinkle around the mouth and even the same eyes (sort of, the kett have a round pupil instead of a cat-eye). The kett's head-plate even has a similar shape to the top of Jaal's head, albeit slightly deformed and obviously made of bone. From what I can tell, the kett even have the head tentacles the angara have, especially visible in the second image; the black fleshy looking bit above the right shoulder looks like it's attached to the head and is the same shape as the angaran tentacles.

So, is it possible that the kett are actually some sort of sub-species of the angara or perhaps even just a group of angaran radicals mutated by Remnant technology led by the Archon?

Or is this just my imagination running wild?

EDIT: something else just popped to mind; one of the early trailers we see several shrouded figures in a Remnant-looking environment walk into some lights - we now recognise these shapes as angarans, so perhaps what we were seeing there was the conversion process from angaran to kett? Sort of makes sense if the kett are actually a group of radical religious angarans that mutate themselves with Remnant technology (hence the enemy names like "Chosen" and "Anointed").