Quite different, in fact. Dark matter is matter that doesn't give off photons out deep in space. We know its there because of the way it bends light (see general relativity) from other sources.
Anti-matter are counterparts to normal matter but with opposite charges. There is far more matter than anti-matter in the universe and there are many processes that can produce anti-matter in the lab. You just have to hold it in a field or something in vacuum because it can't contact other matter without annihilating both.
__________________ Vi veri veniversum vivus vici. (By the power of truth, I, while living, have conquered the universe)
The self is not a fixed entity but a dynamic process of relationships You & I, no distinction. - Tat Tvam Asi
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