Yup... I'd say that this is pretty accurate.
Mainly it's just more of a comfort-level thing. They're more open, more dynamic, more at ease, like they're not as afraid of showing emotion and just talking about whatever when they're exclusively around other women. Where around guys, they tend to act more defensive and closed-off.
Personally, this difference is usually so pronounced that I can, more often than not, tell how women are gendering me without a single pronoun being uttered. That emotional "openness" is a HUGE difference. (And one that I'm so glad I get to be on the receiving end of now.)