I used to play this when I was a kid.
First we have to agree that the subjects are the same. Coin number 1 was sold at an auction for loads of wonga. The size and weight of this coin was 18mm 5.44g.
Coin number 2 is 17.33mm and 5.446g.
Each coin appears to be the same object. Each has scuffs and scratches that could only be from wear and not from the original dies (probably). Now I am not suggesting for one minute that the seller of coin number 2 has done anything wrong and probably bought his coin in good faith.
But can you spot the differences?
Coin No 1

Coin No 2

I will start you off:


And another one:

Do I see a pearl?

There are others, can you find them?