I've had success with evening out the color of Oak using a gel stain glaze. Here is a photo of a dresser I did. You can see I had to switch batches of lumber for the bottom drawers:
A smarter man would have gotten some lumber that was a better match and re-made those drawers but I ain't smarter.
So I gave the entire thing a seal coat of shellac and then layed some dark gel stain on top of that on the lighter colored parts. Let it sit for a bit and wipe off. Repeated until I got a decent match on all the pieces then poly over top of it all.
Those bottom drawers still bug me but the customer was happy so I let it go.
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