Align/crop an image relative to another

I have an image that I am using as reference for its central position relative to the full frame size. Now I have a second image that is slightly not centered as the first one but I need to move this 2nd image in the same position.
I set the guides to the right position on image nr.1 to be used as reference for the 2nd image.
If I use the guides and the crop tool, this guides moves along with the cropping making the guide reference useless.
How can I move the 2nd image to a specific position relative to another image and then develop it ?

Also, I do not want the image to be resized while cropping therefore the "keep external area" is checked (otherwise would have to manually resize it equal to image nr.1)

Hope my question is pretty clear
Thank you
Piero

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