Help can codeine sulfate and hydrocodone show up as the same in a simple drug test?

Yes: Drugs tests look for 2 essential chemicals when they look for opiates - Codeine and morphine, which are similar compounds and they are both converted into each other. Hydrocodone is metabolized into Codeine which is then transformed by acetylation to morphine. These are the final common pathway products for most, but not all, opiates. Oxycodone produces relatively little, is has separate test.