close your eyes and envision a simple monoplane with a large wing and a small stab and picture the CG at 25% on the wing
now have the wing shrink in size as the stab increases --
finally- we will have a canard having passed thru the dual wing setup (nasty SOB)
as the sizes changed , the usuable CG moved aft and ended up almost the same on the thing formerly know as the stab.
if you can't envision this , you
A --don't drink enough
B-- spent too much time in some aero school-