The main difference is that the British Empire was to exploit resources, trade and people. Hitler's expansion main goal is to completely replace the local popul

The main difference is that the British Empire was to exploit resources, trade and people. Hitler's expansion main goal is to completely replace the local population with Germans https://en.wikipedia.org/wiki/Lebensraum https://en.wikipedia.org/wiki/Lebensraum. Interestingly the wiki article mentions why it is a good idea: During the First World War, the Allied naval blockade of the Central Powers caused food shortages in Germany and resources from Germany colonies in Africa were unable to slip past the blockade; this caused support to rise during the war for a Lebensraum that would expand Germany eastward into Russia to gain control of their resources to prevent such a situation from occurring in the future