For the most part, screws are screws, and are decently interchangeable. But not when it comes to drywall and decks screws. Drywall and deck screws are specially designed and treated to handle their specific tasks of fastening. If you use the wrong screw(s) fastening a deck, you're liable to get rusting, expansion, and breakage of your timbers, causing expensive repairs. The same with drywall; you don't want to use the wrong screw when hanging drywall, or else you might destroy a part of your wall.. Avoid all these unsightly and costly errors by finding the right drywall and deck screws to fit your specific job.