What is the difference between norco (hydrocodone and acetaminophen) and lortab?

Acetaminophen: Both have the same narcotic ingredient (hydrocodone) & acetaminophen.Both can have the same dose of narcotic agent, but Norco (hydrocodone and acetaminophen) has less Acetaminophen than vicodin or lortab. Drs. Know that Acetaminophen actually has a high risk of causing liver & kidney disease, so using less Acetaminophen decreases the chances of organ injury.This does, however, mean less synergistic pain relief from acetaminophen.