It's expensive, but here's a 16mm IB Tech print of Pinocchio. It says it's from 1947, meaning it must have the original RKO titles. While there are no screenshots of them, there is an end title; it looks identical to the one we're familiar with, but it still looks a little bit different to me.
The seller says that he replaced the opening titles and about a minute after that with footage from a Kodak SP print because of water damage, so the opening titles are most likely not the original release titles.
I'm sure that the end title on that print of
Pinocchio is not original, either, as it doesn't have the "Distributed by R.K.O. Radio Pictures, Inc." tag, so it's likely derived from the film's first reissue in 1945.
"The dirty f**k!" - Bosko