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alternatehistory.com
So for whatever reasons, for example, less destructive Ottoman wars, no uprisings, quicker regeneration after Ottoman era, no inner customs frontier established by Maria Theresa, etc. Hungary (and eventually Austria-Hungary), population- and economy-wise is much more prominent, than OTL. However the flow of history still goes as OTL atleast until 1871, with Austria-Hungary being established in 1867 with the same terms (one exception) as it actually was.
Here are some diagrams: Germany and Austria-Hungary comparison
Austria and Hungary comparison
To be continued in second post