No, not just iPhone 11 Pro models (up to five hours extra battery life), but most recent models. Ed Hardy has details.
There are sometimes concerns that new iOS versions will cut the battery life of older iPhone models, or slow down performance. Tests on a variety of Apple handsets with the just-released iOS 13.3 show just the opposite — this update not only speeds up these devices, it increases the time between charges.
The benchmarks are worthy reading but even better is pointing out the obvious. Apple upgrades iOS (and macOS, tvOS, watchOS) frequently and that means owners of older products get most of the latest features, too.