I don't know which year version you're asking about, but the original 1950 version is ONLY available in full screen!
The newer one most likely is NOT!
But even if you have the blu ray version, 1950's Cinderella is only in full screen.
And to be honest, full screen is nowhere near as good a movie experience as it is in WIDESCREEN!
I used to be the opposite when I had an old school tube tv. Lol