I created an image comparison tool using Mirador 3. The URL is as follows.
https://ldas-jp.github.io/viewer/input/
The GitHub repository URL is as follows.
https://github.com/ldas-jp/viewer
Below is the input form. You specify the URLs of the IIIF manifest files and the Canvas URIs for the images you want to compare. You can check input examples by clicking the buttons under “Examples.”

Clicking the “Open” button launches Mirador 3 as shown below. You can compare images based on the input information.

I hope this is useful for image comparison using Mirador 3.