Do they show up as the same or are they different when detected in the urine

Yes I beeive they do

Lortab (acetaminophen and hydrocodone) and Percocet (acetaminophen and oxycodone) are both semi-synthetic opioids and require special low-cutoff tests (100 ng/ml). Otherwise, neither would be detected on a standard opiate test panel using 2000 cutoff.

If an expanded panel is used, hydrocodone is broken down into hydromorphone while oxycodone is reduced to oxymorphone. Thereafter the metabolic pathways (enzymes) are different for these two analytes.

GC/MS technology can easily distinguish between the two but GC/MS is used mostly for confirmation testing following a positive return on a less sophisticated initial test.

So the answer to your question lies entirely on the type test used to analyze the urine sample.