If I get a chance tonight, I'll take a photo of them side by side so you can see the difference. Very noticeable. Remember however that the Scout type lights are designed for reliability as backup lights, so as long as they put out a useable amount of light (which they do), they are fine for backup purposes. If you want a reef light for daylight use to look under the nooks and crannies, and it's not going to endanger your life if it blows a bulb mid-dive, the Princeton Tec 40 is the one.
Not that you would, but you could throw a CE or Scout at a brick wall, pick it up, and expect it to both have a watertight seal, and still work. I doubt that the Princeton could survive much more that a drop onto concrete from a few feet without cracking the body or breaking the bulb.