Can I watch this film online?
Watch Lady Frankenstein, aka La Figlia di Frankenstein (1971), on archive.org here.
What are the differences between the US Version and the German TV Version?
In the US the movie is a public domain film and was released several times. The original runtime of over 90 minutes probably was too long for the film distributors at that time; as a result, it was trimmed down to 83:38 minutes. Interestingly enough, most of the cuts edit plot scenes out - most of the sex and "gore" still made it into the shorter US version. A detailed comparison between both versions with pictures can be found here.