The Difficulty no importance here... you get as much your speed is. The Difficulty just make the reward bigger

Amount of coins after 10days more power, more coins!
1GH/s averange network = 2,8kk
5GH/s averange network = 14,4kk
10GH/s averange network = 28,8kk
30GH/s averange network = 86,4kk