What is Scale?
Most kit manufactures usually change the outline of a particular plane for a number of reasons. One reason might be because the full scale version had a problem with linear stability, so the kit maker enlarges the tail. Just about all kits have airfoils different than the original they are modeled after. In a scale judging contest a lot of variables are considered. Does the plane follow the original profile faithfully in every respect? Are all the access d hatches and inspection ports in place and represented along with panel lines and rivets? Finally is the paint scheme representive of a real plane. You have to provide documentation on the plane you are trying to duplicate in scale. That documentation is used by the judges to critique your model. This is really a simplified explanation, as it is vastly more complicated.
Vince