So, the father of codified Communism, who titled his most infamous work "The Communist Manifesto" and then made many references to his ideas as laid forth in said titled work as "socialist", then both are not in fact the same? Now ad to that, that the #2 man in communist history, Lenin, actually stated that "the goal of socialism is communism". Certainly sounds to me like while they may be in the slightest way different, mainly in the means of implementation, they can at least be called twins.
Negative ghostrider. What you are doing, is taking Marx's works (communism) and trying to shoehorn the entirety into socialism, and say they are a mirror's reflection. It doesn't work that way. Marx's ideals can be titled socialist, but it would be incorrect, to assume that all of his ideals ARE socialism. Much of Marx's beliefs, need not be present in order for as system to be titled socialist. To give you an example, the slave based economic system held in our nation's past, was undoubtedly a capitalist system. However, no one would say slavery is indicative of capitalism.