They won't let you change it, but as @SimiKaur said it's largely up to the proctor's discretion whether to let you in or not. Assuming the picture still looks like you, you should be fine (unless the proctor is a major a-hole).
... said that there was a proctor standing right in front of ... she canceled her score.... Another proctor during the start of each ... on the right section. The proctor who called the time would ...
... 's completely up to the proctor. I've heard horror stories ... think as long as the proctor can tell the person in ... . You can't fight a proctor's decision to turn you ...
@ocrickard i think we were totally in the same testing center! I just posted about it here too https://7sage.com/forums/discussion/12789/proctor-nightmare#latest