I guess I misspoke and did not make myself clear. Oxycodone is the opiate that is contained in both Percocet and Oxycontin. Percocet and Oxycontin are brand names, and oxycodone is an ingredient. Percocet has added Tylenol. Oxycontin can be time release (for longer duration) or immediate release.
Oxycodone is more potent than hydrocodone, which is the opiate in Vicodin and Norco.
Phonix, one thing I didn't mention is that it appears you are taking the time release type (evry 12 hours)? If this is true, it is possible it may not be as effective for you if you have a fast transit time. The second dose is delayed release, I think 6 hours after ingestion. So, if you find you are not getting that second "boost," it could be due to a too fast of gut transit.