@nosle Thanks for the files. They are really interesting
Here's a screenshot where you can see the enhanced absolute difference between the motion corrected pixelshift dcu and the demosaiced dcu ISO 3200 file. Black means no difference.
When zooming in it gets really interesting. They seem to use two different methods. A tiled and an untiled processing:
The tiled processing leads to clearly visible transitions:
As you already mentioned, dcu seems to use some noise reduction too.