Face blindness means that I would not recognize individuals I know. Clothing, voice, or other cues would be the only way to know person A from B.
I keep thinking new people I see look like a close relative of an acquaintance. I am not confusing them with the person. Just wondering if they are a sibling or cousin of this person I know.
Usually, I talk myself out of this thinking. Still, it is a case by case event so once in a blue moon, I ask. The more I am around the new person and the feeling persists, the more likely I am to ask.
Once I was correct. She was the sibling of a college friend’s friend. Hundreds of miles distant. Over a decade after I graduated college.
Over a few months window, my brother had a couple people both ask him if he was my brother. He moved across the country to get away from people who might know me. Of course, any time people I know head there, I advise them to be on the look out for a guy who looks like me but with my brother’s hair style.