Scott is right (of course), it can lighten and if exposed to sunlight a lot, will lighten a lot. And surprisingly fast.
But if the wood is from different trees, it can have a distinctly different look.
Now, in Sam Maloof's book, he mentioned working with air dried and kiln dried walnut. If you've seen the two side by side, you'd know how different they can look. I think Maloof said he doesn't prefer air dried like so many woodworkers seem to, he said he likes it all (I think). And he mentioned the difference in colors. BUT, he also said that once a finish is applied, the differences become far more subtle. He did say he has used both air and kiln dried on the same piece, with no ill effect.
What I've found is that applying a coat of Watco Danish Oil Dark Walnut to the entire piece does a fairly decent job of blending walnut form different trees. Not perfect, but it helps a lot.
The further advantage is that the Watco prevents from the wood bleaching too much.
So I would encourage you to take some samples of each of your batches and apply some finish and see how they look. Also try applying something like the Watco Danish Oil Dark Walnut to each, and see how they look. Finally, stick those samples in direct sunlight for a few days and check them again.
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