How Does Endocet Show On A Drug Screen?

I have a script for endocett they are generic percocetts. I took a 15mg oxycodone , and I had to take a drug test for my job well it came up on the drug test that I had opiate or oxycodone in my system but I have this script for endocett , they are sending it off to a lab to make sure the medicine is alright will I pass the drug test with my script even tho I took a 15 mg one ..they are the same thing correct (oxycodone)?

One of its ingredients is oxycodone which is opioid derivative. So, this drug will come up as opioid.

If I have a script for Endocet, but have actually been taking oxycontin.. Will it show up as the same thing??