New Dawn's OK, but it doesn't use the whole FC5 map unfortunately, as of course it's been half-nuked....also no aerial options, there are helicopters but they either just drop off bad guys or, in the expedition missions, function pretty much like the Metal Gear Solid V ones as drop-off and pick-up.
There's also a greater emphasis on 'grinding' to level up your gear in addition to your abilities, and guns for hire characters are harder to recover if they're down if you don't have the proper plants. There's not as many outposts, and the game is kind of built in a way so that you have to replay the same outposts at a higher difficulty level in order to get necessary materials.