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You might try the Image - Adjustments - Match Color function.
The other possibility that comes to mind is to set up the Bucket Fill tool with a small but sufficient tolerance, then sample colors from the other image, and bucket-fill them in the target image. This could be facilitated by putting both images up side by side via the Window - Arrange function, then using Alt-click to sample the color, and just click to fill it.
Thank you for the reply. Yes, the Bucket tool is REALLY CHARMING, but it would lose its charm when I say I have over a hundred files to do this. I just simply want to adjust maybe the colors of the second picture to match the colors of the first picture. Is there any way to do this accurately?
Did you try Image - Adjustments - Match Color? Did it work, or at least get you close, to where you could tidy things up with the bucket?