Let's say, someway, somehow, in 1810 a Prussian army of 65,000 men under Gebhard von Blucher fought with a Russian army of 65,000 men under Mikhail Kutuzov.
Who would win? It is early autumn, and it is at Dresden.
Think of:
Whose army is more elite? Who had better training? Etc, etc.
No outside help. Just 65,000 Prussians vs 65,000 Russians.
Who do you reckon would win?