Sorry, no. The Austro-Prussian war was ended by Sadowa/Koniggratz, granted; but the true point of decision was when France decided to remain neutral, leaving Austria to face the Prussian-Italian alliance alone.
The Franco-Prussian war was not ended until the French failed to relieve the siege of Paris in January 1871, more than four months after Sedan. Only then did the French government accept defeat.
The Franco-Austrian war was not decided until after Magenta and Solferino, when the French and Italian forces had overrun Lombardy and were threatening Austria proper with invasion.
In reality few if any wars have ever been decided by the outcome of one battle. The "decisive battle" is largely mythical.
A fact that bit the Japanese in the butt during WWII They kept looking for a decisive battle that never came.