As @ccc points out, Point, Rect and Vector2 are identical. The same applies to Size, but the other common names, Button and Touch, are different.
import inspect, scene, ui
common = set(dict(inspect.getmembers(scene, inspect.isclass)))
common &= set(dict(inspect.getmembers(ui, inspect.isclass)))
common = sorted(list(common))
for cls in common:
print 'class', cls, 'in scene and ui are', 'identical' if getattr(scene, cls) is getattr(ui, cls) else 'different'
results in
class Button in scene and ui are different
class Point in scene and ui are identical
class Rect in scene and ui are identical
class Size in scene and ui are identical
class Touch in scene and ui are different
class Vector2 in scene and ui are identical