With very few exceptions, they are all ideologies that result in the same outcomes. Despotic leaders, crashed economies, totalitarian control, and millions dead.
The only differences is the language used to describe them as theories in dictionaries/ text books. You are just using a semantical approach to the argument. A Gala and Fuji apple are different in taste and appearance, but they are still apples.
In practice fascism/communism/socialism are the same thing. The evidence found in history shows as much.