ya, so if I get a OEM disc and I have the OEM product it will work.
Yes, OEM disk of the matching Windows version, will work with your code, but there may be catch.
If the OEM disk you get is for a different brand, it may not work. I don't know exactly how the keys are coded, but I have run across some OEM keys that don't work with all OEM disks. Like a Dell OEM Windows disk may not work with the key on the side of an HP box.