CGG, they’re close (close enough to say ‘same’ really) but the average ratios always seem to work out a little different in some areas. Not much though, 2-3%. Yet we seem to think 3-5% on a top tube or stem can be significant, so that’s where my ‘tends to be a little different’ take comes from when it comes to bike fit.
Averaging data to compare different studies I’ve found (all European or US data) is tricky but it’s safe to say that on average the differences aren’t large at all, a range of people of one gender will vary as much as a range of mixed gender. So height-specific is still more sensible than gender-specific, imo.
I expect C of G is more variable than limb length and I’d say that has more effect on bike positioning than measurements, but c of g data is all but non-existent.
CG – sure, we’re all different proportions, that’s the point really.