Can Photoshop extract similar content from two dissimilar images?

Can Photoshop extract similar content from two dissimilar images?

I have two fairly different image files, except for a single element in the photo. Is there a procedure that can be done in Photoshop (or any other app, for that matter) to extract a mask for that element? When applied, I'd like that mask to remove the background, such that the resulting image (with transparency) can be re-used elsewhere.

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Guest [Entry]

"There's nothing that would do that automatically and yield satisfactory results, but you could get most of the way there with a series of channel calculations.

http://help.adobe.com/en_US/Photoshop/11.0/WSFC798FF0-F7E7-4792-814D-808CCC1DCBD3a.html"