Hi Millegreub! I am not sure about your question. I have never seen paper piecing patterns run into 2 pages. The block must be huge! Or are you talking about applique with the freezer paper method?
For applique, I copy both pages and then tape them together to match up the lines. The I copy it to freezer paper and also to some type of thin see through material so I can align the applique properly on my square.
For regular paper piecing, make sure your block is all on one page. When you make copies for each block Align them p and hold it to the light to make sure they are copied the same. Hope this helps.