[dilap]

It's software, but it seems like some sort of digit-coloring scheme for hashes could make fakes easy to spot by eye. The simplest thing would just be a different color for every character (and and pick very distinct colors for similarly-shpaed characters). Or maybe color groups of 3 digits or something.

[x1798DE]

If you're using software to display both key ids, why not just use software to compare them?

[vidarh]

They may be on different devices, for example. I agree we should use software to compare them whenever possible, but sometimes it is practical to be able to eyeball differences.