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All things being equal, yeah. But turbocharged engines are very rarely designed equally to naturally aspirated engines. Typically, they have lower compression ratios at the very least. They also have beefier internals which I'm sure doesn't have a gigantic effect on efficiency, but its got to have some. They're also typically smaller than the normally aspirated engine offered in a car. If we get into fuel management, they also dump fuel (open loop operation) to prevent detonation which generally isn't an issue with naturally aspirated engines (unless you really wind them up). So, its quite hard to do an apples to apples comparo.
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