Sexing Mallard Ducklings

I have 2 Mallard ducklings that I hatched out on June 10. They are growing up quick and I’m not the best at sexing ducklings. They both have juvenile plumage (duh), but their beaks are still black. I’ve noticed a green tint on the tops of their heads. Can anyone tell me what they think their sexes are? They look exactly the same, and I could only catch one 😅
That's a greeeeeen bill. looks like a boy. not sure about the other one lol
 

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