^ nowhere because this information is easy to find on the site and off.
The opioid conversion chart toward the top of THIS forum would be a good place.
7.5mg of hydrocodone is approximately equivalent to 5mg of oxycodone so 10mg norco would be slightly more potent than 5mg oxycodone but some people will prefer one or the other.
If you have any questions, please feel free to PM me or the other BDD staff.