You sure can .....
If you already do not have them,
download the MENTOR translation tools from supportnet.mentor.com
they have a OrCAD to PADS converter in the toolset
after conversion, check the results ( some cleanup maybe necessary ).
If you do not have access to Supportnet, check out conversion vendors (ex: Logicswap, PCBDesign200, etc) as they do this type of work. Good luck!