Different things. They're quite different things. Aspirin is an anti-inflammatory, anti platelet agent, pain med. Hydralizine dilates blood vessels, and is used for heart failure and or blood pressure.
Aspirin/Hydralazine. Not likely, different mechanism of action.
See below. Not sure of your question. Those are two completely different drugs used for totally different things. Aspirin is an anti-platelet drug to make your platelets less sticky so they don't form clots in the blood vessels that could lead to heart attack or stroke. Hydralazine acts on the blood pressure, pulse rate, and dilation of the blood vessels.