In case you havent gotten an answer yet...here are the differences:
Vicodin is
Hydrocodone (5mg) and
Acetaminophen (this might vary I think (750mg?), but usually 500mg)
Norco is Hydrocodone (10mg) and Acetaminophen (this can also vary but usually 325mg)
Percocet is
Oxycodone (5mg?) and Acetaminophen (500mg I think)
Percodan is Oxycodone (5mg?) and
Aspirin (not sure on the mgs)
I know that Vicodin ES is Extended Release but not sure on the HP.
No idea what Maxidone is.
Hope this helps