The standard only says silver phase should have dark brown/orange legs. It doesn't say anything about the legs of gold phase, I'm assuming they should be the same?
It is my understanding that if you breed a Golden Drake to a Silver hen, the draklings will be silver and the ducklings will be gold. This is because it is a sex-linked gene. Other than that if you have two golds breeding or two silvers together, they can produce either gold or silver offspring...