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There's no dupe content filter, but the new copy won't outrank the old one. But I think that's a moot point.
Unless the two forum software packages both use the same schema, you're going to have a very hard time moving content from one system into the other. Posts are probably stored in one table, users in another, forums in a third, at a minimum. You'll need to copy the data from these tables into your new system, without breaking their referential integrity.
If you have an idea what that means, then this question probably belongs in the database forum. If you can provide the schemas, people will help you craft queries to move the data around. If that's possible ... you might need a client app to do the work.
Obviously, once you've got the data moved, you won't need to host the old copy along side the "current" data set. At that point, there's only one copy of your data.
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