The English dubbing, from 1966, was done, presumably, by Childhood Productions.
https://www.imdb.com/title/tt0047843/
There are three user reviews, but, unfortunately, no external reviews - even in German.
You can watch it here - it's just over 70 minutes. The star, Rita-Maria Nowotny, was also in the 1950s versions of "The Goose Girl" and "Hansel and Gretel." In 1984, she directed and produced "Snow-White and Rose-Red."
https://m.youtube.com/watch?v=jTlJp9ufdoA
This is essentially the Grimm version plus Perrault. That is, yes, as in Perrault, there's a godmother and a coach (made from a gold walnut), but there's also a magic tree, talking doves, shoes that look like gold, and the stepsisters DO cut off parts of their feet! (Not that you really get to see that, of course.)
And, to my amazement, before the ball, the godmother says Cinderella should have a crown with her dress, which she gets. Why is that amazing? Because it would fit in perfectly with a coloring book that likely was also made by Childhood Productions, soon after 1966! Hope I can find it. (There are maybe other publishers involved as well.)
Lenona.