It's a given that your shots are going to look like you, so any obvious change in physical appearance will require a new headshot.
Thumbnails—those miniature headshots posted on casting websites—are identical to their 8-by-10-inch counterparts. Except, of course, they're smaller.
Don't just take someone's word that a photographer is great. There are tons of headshots photographers who are great, but that doesn't mean they are right for you.