When you visually compare two hashes, how many digits do you check?

The strings hashed below are "retr0id_18b1f814a8e2d9c4fb9c" and "retr0id_1253dea672ebfa240e94", if you want to check for yourself.
@retr0id First 24b, last 24b, rough shape of the middle, then look closer if they're shaped different. This passed the head and tail, but too many letters in one vs. the other.