Compared are the US Version (German DVD by Warner) and the UK Version (UK Blu-ray/DVD by Lionsgate).
After the death of his parents, young Victor Frankenstein inherits everything. In subsequent years, the devotes himself to scientific studies and experiments. At some point, he is even better than his home tutor Paul Krempe. During their ongoing research, they develop a method that allows them to resurrect a dead dog. Inspired by that, Victor plans to create a human being. He collects several parts and he starts killing people as well. Step by step, Paul is involved less and less and he also tries to Frankenstein's niece Elizabeth as well because she wishes to marry Frankenstein. When Frankenstein manages to bring his creature to life, he loses control over his creation and the monster turns against his creator.
The search for new footage resulted in the Hammer Studios releasing a Frankenstein remake in 1957. The Curse of Frankenstein was a huge success and revived a dead genre. The result were numerous horror flick the studio is still famous for today. Due to a potential lawsuit by the Universal Studios, no actual remake could be shot. Instead, both content and the look of the creature were heavily altered. Since the screen adaption by Universal only adapted a few motives from the novel, this has never caused any issues. The movie now focuses on Frankenstein himself who is being corrupted by his own ambitions to bring a creature to life until he has to face his own creation in a dramatic finale.
According to the IMDB entry (click), the scene with Frankenstein dissolving some severed head in acid was cut in advance due to BBFC restrictions. For the US market, a further shot was cut. The one with Frankenstein looking at an eyeball via magnifying glass. This cut US Version has been released numerous times over the years - on both VHS and DVD. Those releases are all from Warner. The UK Blu-ray (which contains a DVD as well) by Lionsgate on the other hand contains the uncensored UK Theatrical Version. The acid scene is being considered lost so that one is still missing. There is still at least a little hope though because after all the lost footage from Dracula for intance has been found on some Japanese movie role (comparison).
The UK Blu-ray contains the movie in both 1.37:1 and 1.66:1 while the German DVD (= US Version) contains the movie in 1.78:1 (masked).
US Version (German DVD): 79:47 min
UK Version (UK DVD): 79:46 min
In the US Version, Victor looks at the eye with a magnifying glass first.
In the UK Version, one gets to see the eye through the magnifying glass first and then Victor.
US Version: 4 sec
UK Version: 4 sec