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I can't think of any way to get an action doing this (which doesn't mean there isn't one), but to make the manual process a little easier, when you've saved your slices and imported them back, use the 'auto-select' feature on the move tool and have 'snap' turned on in the view menu (maybe 'snap to' layer). That way you should be able to easily move them using drag and drop and ensure they all line up and complete the task quite quickly.