The alternate version had various working titles---Tarzan Returns, Tarzan and the Vampires, Tarzan, and finally, The Capture of Tarzan. The story about the preview audiences for The Capture of Tarzan may not be true---
Rudy Behlmer (an authority on the Tarzan pics) feels that it may not have happened and I have not come across any primary evidence that it did in contemporary news stories/reviews---just a possibly apocryphal story in a secondary source from the 1960's, which is repeated by another author more recently.