Call your local HFO and check with the parts department to see if the board is compatible. Most newer style I/O boards are backwards compatible, however the style of plug connectors may have changed and/or the location may have been changed as well.
If you have the correct I/O board, ask the parts dept. if they can provide you with a copy of the install instructions. These are important to have as the boards work for a variety of machines and need to be setup appropriately for your particular machine. You may need to fab up some pigtail connectors to convert between some different style of plugs from the old pcb to the new. Again, the instructions will list out which cables need the pigtails, if at all.