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Different colors do differentiate different sexes about 95% of the time. its easiest to tell by the color of down on the shoulders, with males being cream white and females being grey. Look back throughthe thread, there is some info on it. Darks and Partridge will be easier to tell apart anyway becaus the cockerels and pullets end up colored differently while the colombian (light and buff) are colored the same.
not sure about the feet.
The one on the left in picture 2 has vulture hocks which will be a disqualification. They can have too much leg feathering, the standard says, feathers only on the outside toe, middle toe is clean, but this often comes off at first molt