Spaces

I have a AutoCAD drawing of our LAB Layout. I use this to create a PDF Called LAB MAP to show the areas and who they belong to. I created a SPACE for each different LAB area and saved the PDF. Each area has it's own Color to show who has what space. Now I made changes to the Org AutoCAD drawing and saved a NEW PDF Map. How can I bring over the Spaces from one PDF to another? I do not want to go thru and re-make all the spaces over again.