Question..... Lionel Legacy Engine 84687 NPR Berkshire and 82767 Allegheny both have Dual Smoke Units. Looking at the schematic Lionel provides on their parts website they look identical, however each has their own unique parts number. The Berk is part number 6802695200 and the Allegheny is 6801181200. Each is $75 Does anyone know for sure that these are identical parts or are there differences? thank you
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