I think they may interelate due to the fact that there's only so many ways or one way a joint moves properly. I don't think the japanese styles have a monoploy on joint locks, chokes, or throws just because those arts may focus primarialy on such techniques. I've seen many other arts with joint breaks, and such in them that were executed differently than any japanese art.
The elbow and knee only move a couple of ways, it would be pretty easy to hyper extend or break these joints even on oneself.
I think each art does the same joint locks just with different purposes, ends, and entries to the joint breaks.
EX. Wing Chun an art focusing on striking. If we don't achieve the arm break or a joint lock we let it go and continue striking. When I took JJJ if we couldn't get the joint lock, we went for another variant, or another hold, or tried to make the joint lock work far longer than I would now as a WC practitioner.
Aikido seems to flow with the person's energy and focus's on "throwing" the person away from their space with joint flexes, breaks, or such. While in JJJ we'd focus on keeping them close to us as we broke the arm. And in WC (at least I'm trained this way) if we get the break cool, if not then we flow with striking, kicking, and such as if we never even tried to get the arm break in the first place.
All different entries, approaches, ends, means, and goals. But, very largely, the very same joint locks.