Much different. Comparaduns are tied without hackle and with split tails. The wing is tied in an upright fan style or 180 degree arc so that the wing supports the fly and helps keep it sitting upright. The wing can be tied with deer hair, cdc feathers or synthetic materials like z-lon (I like CDC best). The fly sits low in the water and tends to work best on slower currents. It floats pretty well but not as well as the parachute or traditional Catskill style patterns. A trailing shuck of z-lon or antron yarn can be added in place of the split tails to make the fly into a emerger pattern called the Sparkle Dun.