Germany's borders are different in that it has Bohemia. Which would give Germany a few million Czechs.
Turkey(Ottoman Empire) has Bosnia back and the Dalmatian coast along with Montenegro.
The colors don't mean anything I've taken the Template from Matthew Whites homepage. I didn't really think of a time-line I just made the map.
Guess it could be something like Prussia takes Bohemia as a prize after the Austro-Prussian War later the German states unify in a similar manner (sans the border with France similar Franco-Prussian war)
Serbia still breaks away but Austria rather than Turkey is Europe's sick man.
The Austrians have a revolt in their country sometime after 1878 Austrians leave the Province. Turkey sends in troops to reclaim the area Montenegro tries to take advantage of the situtation for territorial gains and clashes with Turkey. Turkey reclaims Bosnia and annexes Montenegro, the Dalmatian coast is ceeded to Turkey-say Turkey and Austria have a war during this which they loose to Turkey.
Something like that.
BTW here's a
link unedited template.