I think I’m the author of the only scholarly article comparing those two documents, It is K[evin] R. Constantine Gutzman, “Jefferson’s Draft Declaration of Independence, Richard Bland, and the Revolutionary Legacy: Giving Credit Where Credit Is Due,” The Journal of the Historical Society 1 (2001), 137-154.
Which part of their theory do you have in mind? Surely Bland’s claim, picked up by Jefferson, that man has a natural right to emigrate is directly contrary to the British understanding. so is the claim that the English government had no role in establishing the North American colonies. Please be specific about your point, and I’ll reply to your query directly.