Cool but I had asked what if Austria and Prussia went to war against Russia instead of France and Britain going to war against Russia
Why should Prussia go to war against Russia? Russia and Prussia were big friends until around 1900.
But if they do it, you could see the same German unification. Oh, and maybe, as a "punishment" for Russia, independent Baltic states and a free Finland. And if they really want to annoy Russia, Prussia and Austria can create a puppet state in the Russian part of Poland.