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Does the difference run the full length of the stock? Can you post pictures of the stock (bottom??) where the two colors meet? It may be that when the stock blank was cut, part of the wood is the sap wood & the rest heart wood. They would be different colors. Sunlight fading the stock is another possibility.
It starts to darken past the wrist and forward past the lower band and on the bottom about 1/2 way around.