My guess is that the Gakuen versions are intended to be a little younger, but with Himaruya's art style and how the characters don't seem to age too much (except when it's real noticeable like America and Italy's growth spurts, or France developing the stubble), it's hard to tell the difference.

The capitals might be harder to implement too, as Mint said. And if you thought micronation vs. bigger nation debates got hectic, capital ones would open a whole new can of worms XD. It does make you wonder though, since some capitals have changed/shifted, what those characters would even be like in theory.

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