> Practically, it means I'm rubbish at remembering people. I've developed some techniques that help, but if someone changes their look significantly, it's very hard for me to identify that it's the same person.
Do you perhaps have a mild form of face blindness?
It definitely manifests as that to some degree, but since it extends to hair, clothing, what car they drive, I think it's a more general situation.
(But I'm also not specifically aware of face blindness as a condition, and had assumed it was generally some form of aphantasia.)
I would tentatively suggest OP does. I hace aphantasia but meet a lot of people for work and have a very good memory for names once I see a face.