exchanging the sky of one photo with the sky of another has been a typical photoshop task for decades. the 2021 version of the software, however, does this with just one single click. i loaded the rather dull original photo (top left) into photoshop 2021, applied one of the sky templates (top right) and was done. no selection necessary.
the photo on the bottom left was done with a single click: i just used another sky template. only the bottom right image needed some special attention and hand work.