Chances you run into your doppelganger in public - decent chances
Chances it is merely a coincidence that the current Chancellor of Germany is the spitting image of the Fuhrer AND his mistress - unfuckinglikely
But the sample size is totally different.
Every time you go out in public you have hundreds of chances of running into someone who looks just like you. sample size = huge
There are only so many German heads of state. sample size = tiny