After you book match a piece of wood with sapwood, any additional thicknessing and sanding will typically reveal more sap wood on one side and remove some sap wood on the other, depending on how close to perpendicular it is oriented. Look at some very expensive guitars using sap wood and you will see a similar asymmetry, sometimes.
When book matching in general, the more figured the wood the less likely a "perfect" book match will be.
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