They are the same, both narcotics to treat pain.
oxymorphone is generic name for opana and oxycodone is generic name for percocet/oxycontin also oxymorphone is norm a extended release tablet and percocet is either immediate or sustained release.
Oxymorphone is a stronger medication than Oxycodone and both are available in instant release and extended release versions. They are both opioid medications. Oxycodone is abused slightly more frequently but both are sought by narcotic abusers. Both are available in brand and generic versions but Oxymorphone has a different time release mechanism in the generic versions than what is in the brand name version. I hope that helps.
The difference is in the molecular structure, also oxymorphone is stronger
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