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Charcoal is very different. Graphite is mostly different kinds of pencils, but the material of the charcoal is very near from carbonized wood, the graphite is "the most stable form of carbon under standard conditions. Under high pressures and temperatures it converts to diamond."source

on the surface the pencil has more precision, the charcoal is more rustic, sometimes you have to sharpen it too, but the graphite in pencils is harder, so the lines are more defined. the charcoal gets dirtier too, is necessary to be more careful not to damage the paint.