There’s no major difference between the two but they can still work in separate ways. Apple Vinegar is mostly used in marinades, salad dressings, vinaigrettes and as a preservative and will give a more apple flavor than vinegar.
There is no evidence to show that one has greater benefits than the other, there’s plenty of nutrients in both. If you’ve only got Apple Vinegar you can be sure it’ll work in the same way, it just might taste a little sweeter!