Yugoslavia would've just been the Serbian Empire.
In any case,
the major change to the world wouldn't've been anything in Europe itself. China had just finally gotten rid of the Qing Empire and was a basketcase; without Europe committing suicide and losing all interest in playing its factions against one another, it would've been firmly carved into spheres of influence before it could get its act together:
View attachment 546974
Note that this map understates Russian claims in both Manchuria and Xinjiang and doesn't note well that Korea and Taiwan were already held by Japan. Also weird of them to mention Hangzhou and Chongqing and not the major international settlements at Tianjin, Shanghai, etc.
Decolonizing China would've eventually happened: for all the talk of its atheism, there's 3000 years of nearly religious love for their land, its reunification, and tossing foreign rulers at the first available opportunity. Martyrdom for that cause is nearly as big a thing as it is in Islam, even without the promise of much of an afterlife. But without Mao spiking their birthrate, without Deng bringing in the One Child Policy, without He Kang and China's teams of Norman Borlaugs' focuses on improving rice output and engineers' focuses on major dams, without active American/Soviet support of its war efforts, development, etc., you might've been looking at the late 20th and early 21st century as a long boil of terrorism and reciprocal massacres amid dystopian quality of life and still-ongoing triennial floods of the Yellow River plains.
As far as the Eurocentric part of this goes, the intersection of the NS and EW trunk lines at Wuhan would've risked becoming a second Fashoda as Britain tried to maintain its hold on the Yangtze basin and France tried to push north across the mountains from Guangdong into entire provinces underlain by coal fields. Sichuan, Hebei, and Xinjiang would've been other powderkegs.