I haven't ridden in all the Circle Y models but I have ridden in half- a dozen or more. My favorite saddle I ever had was a Cricle Y and it got stolen. I have never rode in one I didn't absolutely love.
But you are right they are basically the same thing with minor adjustments made to a similar base.
"Whenever you feel like criticizing any one just remember that all the people in this world haven't had the advantages that you've had.” - F. Scott Fitzgerald
I don't hear well and therefore I don't spell well... please don't pique on me!