While the discussion of the question of whether boys and girls should be coached the same goes on I found some resources that may interest you. Of course, the first thing I found was a paper that seemed perfect (“Sex Differences in Sports Across 50 Societies”) but like so much research now, the publisher wanted $36 to get a copy. (None of which goes to the authors, by the way, which just adds to the reasons why I will not play their game. If anyone wants to buy it, read it and report on the contents, I wouldn’t be opposed.)
Next I found a paper (for free) entitled: “Sex Differences in Sports Interest and Motivation: An Evolutionary Perspective” which you can find here.
And then I found “Gender Equality and (Elite) Sport” which you can get, again for free, here.
Both of these seem interesting enough and apply to the question.
I would like to know what the archery participation rates are in a country like Korea. Participation is, in essence, by invitation. There is no reason that different numbers of boys and girls would be selected as they do not compete with one another and the numbers of Olympic and World Championship medals available to each sex are the same.
It seems that the more people who participate in a sport, the higher the level of performance. This is obvious in an example like Korea which went from an Olympic archery nonentity to a powerhouse, fueled to some degree by a massive increase in participation. (Obviously other supports like coaching and opportunities to practice, etc. also apply.)