4t65e rwb replace with rnb

My dad has a 2000 buick Centry with a 4t65e transmission. The identification plate in the transmission says it is a RW model. He has a lead on a used transmission from a 2000 centry, 4t65e, but it is a
RN model. Does anyone know if this transmission will work in his car? Or does anyome know the difference between the two.

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