Electronic boxes on Rotax DD2

Hi guys I have 2 dd2s one has an electronic box and the other doesn’t can anyone tell me why? Is one older than the other or does one make more power than the other?

One will likely be a pre evo motor where the power valve is controlled by exhaust pressure. The other one will be a later evo motor that controls the power valve via amthe ecu. They will also have different carbs and a few other differences

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