346XP NE -any diff between old non-cat and new non-cat muffler?

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wildbio

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Does anyone know if there is any difference between the old non-cat muffler for the 346XP (part #503 86 28-03) and the non-cat muffler with the newer part number (part #544 02 83 01)? They look the same in the parts diagram....just different part numbers.
 
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