No need to describe the differences. Just have a look at this animated gif.
The two images were cropped, upscaled, realigned, then jitter animated.
(Sorry for the late addition - just discovered the thread.)
Extremely partial solution
Since no one appears to be making any actual progress with this, I'll post what I have. I'm pretty sure I know what the main mechanic is, but I haven't been able to make it work. Presumably I'm missing at least one important idea.
First of all, those hints:
A further difficulty
This is way less progress-towards-a-...