Unless Loutre says otherwise, my belief is that every server gets practically the same amount of diamonds.
But to be honest, needing all 3 weeks of challengers diamonds hoarded in order to pass that requirement is atrocious and awful game design.
And I dread to think about the contest in 2 months where one will be only able to use diamonds from weeks 1, 2 and 3 (because with the current contest we are at 1st week, next will be with the 4th week and the one in 2 months will be on 3rd week).
If it were just halved to roughly 5,000-6,000 diamonds, I would call that OK. But anything above 10,000 is just painful garbage.