Rosberg is one of just two team-mates to best Hamilton over the course of a season, having memorably beaten him to the title in 2016 after a bitter duel between the pair.
The German recently revealed he required two hours of time with a psychologist every day to put himself in the right frame of mind to beat Hamilton, who looks on course for a sixth drivers' title this year despite Bottas' improving form.
And Rosberg says Bottas is on the right track, but must continue to work even harder.
"In my case, Lewis is a slightly more naturally talented driver," Rosberg told Ilta Sanomat.
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