Marie,
I'd say from personal experience that most are
different. My wife has well endowed labia although not "massive" as
I've read some women describe theirs on this site. I say most are
different because I've been with several other than my wife. The
least memorable pussy was the very first one I got into, it was a
slit between her legs, my first thought upon seeing it was, "well,
where's the rest of it", she was not much fun to go down on. After
that it became my experience that about one in four women have some
measure of endowment to their labia, about the same as men in
variance to their penis size.