Looks to me like you have two different parts of the tree, that means the one on the left looks like heart wood and the one on the left has sap wood in it. Totally different structures in them. There are differences in the chemical makeup of the wood that would affect flavor, such as sap, lignin and and cellulose.
If you look at is from a construction point of view, heartwood is denser and heavier, it has more materials but less sap. The outer layer is sapwood, it has more sap, but, less of the material that makes up wood. There is probably an effect in the smoking of the wood that would affect the nature and amount of total suspended solids in the smoke.