Saying you can get an agent with one DT to follow the output of another DT by changing its utility function is not interesting.

If the mapping is natural enough, it establishes relative expressive power of the decision theories, perhaps even allowing to get the same not-a-priori-obvious conclusions from studying one theory as the other. But granted, as I described in this post, the step forward made in UDT/ADT, as compared to TDT, is that causal graph doesn't need to be given as part of problem statement, dependencies get inferred from utility/action definition.