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(Repeats story published on Wednesday with no changes) SINGAPORE, Jan 20 (Reuters) - Top Asian oil and gas producer PetroChina has swapped the portfolios of two top trading executives in a management reshuffle, sources with direct knowledge of the matter said on Wednesday. The personnel changes, aimed at keeping managers fresh with new challenges, are not likely to alter in a significant way the business strategy of PetroChina’s flagship trading vehicle China National United Oil Corp, or Chin...