It totally sounds like that but this is true, there have been multiple cases with twins being separated from birth and then reunited in later life and their lives being very very similar. It's incredible and is also used as evidence in "Nature vs Nurture" debates that nature plays a key role in a persons personality.
and here's an article about their lives http://allthatsinteresting.com/jim-twins
and here's another https://firsttoknow.com/jim-twins/