Re: All else being equal...
Indeed. It (dons asbestos underwear) ignores the glaring fact that certaintly in the UK women are legally entitled to 12 months paid maternity leave, while men are not.
2 weeks paternity leave really isn't the same thing.
Not sure about the US but there many enlightened countries with similar rules.
On this basis alone there's are a vast difference. Men and women doing the same job in the same company, to the same level on the same terms, are not actually on the same terms.
To be truly comparative, one needs to compare the additional cost of such female-only benefits perhaps aggregated over the average employment duration of those claiming maternity leave. This alone may drop the difference significantly.
Anyone calling this out regularly gets flamed as a sexist mysoginst pig.
Oh well. Flame on!