The fact that this works means that comparing keys visually by their artwork is insecure, since it allows you to generate a key pair which looks very similar to a target public key. I guess visual fingerprints might not have enough entropy.
It's enough to find a fingerprint that's visually similar enough. It doesn't have to be exactly the same. That's many orders of magnitude easier than finding an exact match!
It's probably still more secure than trying to compare the regular old string representations (who checks more than the last 5 characters from the end?)
And plus, you still have to brute force it to get one that looks close
