I think the whole rat/bull/gopher group of snakes has that pattern and can vary in color, but the corn snake is called the red rat snake because that coloration is common. That'd be my guess. I have one skin like that too, so wide that it's painful to put on using the center pattern as there's so much waste. Beautiful snake. You can approximate that color with a regular rat/chicken snake by dying your bow orange before applying the skin. I really like the look of fresh osage under a skin, but it fades in time.
George