It depends on how closely you want to define scale. A really and for true scale model will tend to have similar characteristics ( withing the limits of scale effects) to the full size aircraft. Even most "scale" models don't scale airfoils, power loading, weight distribution and so on. By today's standards WWI fighters had VERY short nose moments, the mass of the aircraft was concentrated very close to the center of gravity and the center of gravity was rather far aft. Many of these aircraft (including the Camel and the Fokker Triplane) had divergent stability, meaning they would stay anywhere but where you put them. One of the reasons they stopped using rotary engines after the was was that they had been pushed to the practical limits of what physics would allow in terms of a light weight aircraft with a couple hundred pounds of gyroscopic mass hanging off the front end. Up to a point, the rotary engine was a miracle of applied technology. So to answer your question, models often have a more tolerant airfoil, they are balance in a manner that allows greater stability and the don't have the gyroscopic of the entire engine spinning round along with a relatively enormous propeller. There is an entire dissertations worth of factors that effect the stability and maneuverability of an aircraft but these are just a few of the factors. As far as it goes you shouldn't expect a WWI bird to fly like a pattern ship or a trainer. Even a tamed Camel will have it quirks, that's half the fun. If you are worried about the handling find a thread by someone who has built the SPECIFIC model of the camel you are considering and see what they have to say. For instance the Hanger 9 Camel and the Proctor/VK Camel are both very nice planes and are not that far off in size but they have different traits and handle a little differently.