Labrador retrievers are yellow, golden retrievers are golden.
Some of the Show labs are really heavy, far too much so, and I would presoanlly penalise those as not being 'fit for function' when judging, but then again many of the working labs are far too tall and lean to be any good in the field. Some are more like lurchers than labs. Whatever the type of work they do, show or field, they should all fit the KC standard. A lab should be built for endurance and heavy deep water work, not for sprinting