URL of Image not generating the same image

I just noticed something I have not seen before. I generated an image in Firefox (based on an old favourite stored in Firefox). I then copied the URL and pasted it into Microsoft Edge and recreated it, and the image is different. Note, these are using Model 1. I thought they were supposed to be identical. Am I wrong? The quality of the second one is worse, which is actually what caught my eye. Almost looks like the model got lazy on the regeneration.

Also strange, in Firefox, there is no "Copy Image" function:

This was the actual original in favourites on Firefox (for reference, it is not directly related to this bug report):

This is the regeneration of the original image in Firefox. Note, it is not the same because all of the styles were stripped out, a problem I reported some time ago. I then did my best to re-add the styles I believe it had. Obviously, still not exact (but that is not the issue I am reporting today):

Orbit City, the futuristic metropolis built on stilts high above the ground with flying cars and space ships. The buildings were all sleek and modern, e., pop art, few colors, Comic book style; cartoon Dot effect; silly comic oversized features,bright colors, High contrast; Wrong colors, contrasting colors maximalism storybook illustration street art digital illustration comic art Marvel Comics 

Then I copied the URL from this image in Firefox and pasted that URL into Microsoft Edge and regenerated it. I expected the images to be identical. They are not identical. The second one has less defined lines worse use of colour, and honestly just looks sloppy.

Regenerated image from URL in Microsoft Edge:

Orbit City, the futuristic metropolis built on stilts high above the ground with flying cars and space ships. The buildings were all sleek and modern, e., pop art, few colors, Comic book style; cartoon Dot effect; silly comic oversized features,bright colors, High contrast; Wrong colors, contrasting colors maximalism storybook illustration street art digital illustration comic art Marvel Comics 

Mac Studio

MacOs 14.4 (23E214)

Firefox 124.0

Microsoft Edge 122.0.2365.92