Interestingly, the 100m record difference is about 10%, which is roughly the same as the gap in the ultramarathon records (and in the record mile time). So the difference is fairly consistent across distances.
I don't think it's quite that close -- there may be sample size/participation factors involved here. For example, the top US women seems to be competitive with the top ~10 US men, which in more testosterone-dominant sports would never happen.