OK. If I were doing this I would have them all in the same SketchUp model file with each slab sample as a group/component with a tag. I would have of the different versions in the same location and then create a different scene for each one with the same camera location. Each scene would have only one tag visible for the slab it is showing. When you go to LayOut, you can set up the first viewport’s position on the page and size. Then copy that viewport and change the scene to show the next slab. If you are planning on one viewport per page, use Edit>Copy for the first viewport and then Edit>Paste on each of the following pages. Again, don’t do anything to the viewport that results in the Reset button showing in the Camera section.
If you really want to keep each slab sample in a separate file, you could set up the scene in the first one and then use an extensoins called Eneroth Camera Memory to save the camera’s position. Then retrieve the camera position in the next file and save or update the scene. Save, rinse and repeat for each of the other .skp files. Then insert each of the .skp files into your LayOut document.
Personally I think the first method I describe would be easier to manage all the way through but you can do it whichever way you prefer.