I made some research about the donut nontemperate worlds.
If you're familiar with them, you will know they do generate 2 gigantic icecap poles, surrounded by concentrical squares of respectively subartic, temperate, tropical and equatorial areas.
Equatorial stripes mark the border between the 2 "emidonuts" in all possible direction.
If we managed to invert the order, what would happen? 2 junglish equatorial poles, each surrounded by squares of tropical, temperate, subartic and a artic border.
In few words, the world would be made of 2 squares delimited by ice, in which 2 different stories could develop till Flight and terraforming will make them useless and lead to a final encounter of 2 superpowers/alliances. !!!