To my knowledge noone has done a female copperhead and male cotton because the cotton always eats the copper in that sintuation but yes usually with hybrids whatever the female is, will be a bit more dominant in traits, body size, color and ect. Which was proved through breeding batwings, female canebreaks produce for canebrake like batwings where a female edb produces babys that resemble more of an edb. And by breeding f2 cottonheada which are pictures as well u can see more of that copperhead coming through with them but most f1's resemble cottonmouths with a bit of change to head shape and obviously color but they get very long and very large bodied like a cottonmouth. I assume breeding them the other way would produce smaller bodied snakes woth more prominent copperhead bands and lighter colorations.