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In fact, any kind of policy information (robots.txt and the robots meta tag are nothing else) should always be consistent across all the channels you use. What point is there in saying "no" with your left mouth, and "yes" with the right?
The only situation where this could make any sense would be when excluding only one (or several) specific spiders from robots.txt and allowing all others. But the phrasing of your question makes me think that you either want to allow all of them or none at all.