Are the Bezier curves found in expanded glyphs the same curves used to create the font files? more points or less points?
They should be exactly the same.
... unless the font didn’t consist of cubic bezier curves in the first place. TrueType outlines (quadratic bezier curves) are converted to cubic beziers, which Illustrator isn’t particularly good at. So expanding TrueType fonts will insert additional points on the curves.
Oh yeah, I forgot about TT outlines.