I would say that British English and American English are very much alike - with a few exceptions.
If you find British English and American English soooooooooooooo TOTALLY DIFFERENT -
what do you say than to other languages - in case you know any others?
German and English are much closer than Hindi and English. Using familial relationships as a limited metaphor - Hindi and English are distant cousins while German and English are step-brothers. The difference is an overabundance of Norman French which flooded into Old English following the Norman Conquest of Britain in 1066.