I think the only genetic difference is the color of the meat, all else being the same. When i was in AK, fishing/processing, we saw the occasional white coho I think they said like one in 100,000. These were just considered albinos as albinos occur in most animal species. I am not sure why some kings developed into white king runs. A big percentage of the white kings we caught in southeast were true hogs going 50 to 60+ pounds. They were considered better eating then red ones though I cant attest to much difference myself. C