Will Darvocet and percocet show up as the same thing on a urine drug screening?

No. They are not chemically related and would have to be tested for separately and specifically. Hydrocodone is a semi-synthetic opioid usually made from thebaine, an alkaloid naturally found in the opium poppy. Darvocet is a combination of acetaminophen (tylenol) and propoxyphene, a totally synthetic drug chemically related to methadone.