It looks like all three of them are just the Blu-rays run through a sharpening/upscaling process. ROTS really suffers from sharpening artifacts while AOTC looks better for the process.
I’d say that they went back a generation. Not the actual BR version, but the master the used to make it. AOTC actually looks like it has more detail. I’m guessing whatever they did to “clean up” the image for the blu-ray is gone and they have “cleaned up” the video for 4k.