Request: when comparing images, use different color for where detail exists and where detail not exists

[FaceCrap]

I couldn't come up with a better one-line description, and this is probably not possible to do, but here goes...

When you compare two images and opt to highlight the difference, the highlight that gets used is the same color in both images.

This makes it difficult to determine in which of these two images the detail is present or not.

What I would very much like is that if a detail difference is detected in one image, which is not present in the other image, that the highlight in the image where the detail is present, would use a different color from the image where that same detail is missing.

Some example Images are probably better to show what I mean.

Without highlight

With highlight

Zoomed in, it's fairly obvious which one has the change, but when vieming a larger area of the images, it becomes increasingly more difficult without the highlight added.
Since I want to see which of the two has the change, having it colored different from the image where it is missing would be a great help.

I imagine that it probably only is possible by differentiating between source and target image and some blocksize threshold to reduce differences less than X pixels in size.