I dont see how it could show up different, since the active drug in both oxycodone and oxycontin is the same drug, oxycodone. Oxycontin has been formulated where part of the drug is released as soon as you take it and the rest is made do dissolve more slowly. Thats why your not supposed to chew or break the tablet. It's like taking morphine IR or morphine ER. They will both show up as morphine.