No, that is wrong, well, it depends.
My DELL disc, is just a standard XP disc, with a DELL logo on it, the only thing different about the installation, is the fact, the disc leaves a folder, called "DELL", in the C drive, which you can just delete.
If the disc is fairly new, i.e. 4-5 years, the disc maybe just a standard XP disc.
Just try it, no harm in trying - what's the worst that can happen? - It won't work? Oooohhh...!