Perform a functional group analysis on oxycodone and morphine. How are they the same and how do they differ?

note: the only difference I see is the OH molecule on thr oxycodone, but theres just an H molecule on the Hydrocodone. Its hard for me to explain where these functional groups are located. There's 5 cyclohexane molecules, how would I accurately describe the locations? We havent gone over nomenclature on these types of molecules yet.

H OH N-CH3 N-CH3 H Oxycodone Hydrocodone