Can someone tell me what is the differences between public relation and legal ethics?

Question

i know there is, lawyer practise in court of aw where there is fairness and equal representation while PR work in court of opinion.

Lawyers advise clients on what they must legally do to defend themselves in the court of law while pr advises clients on what they must do to defend themselves in the court of public opinion

Lawyers advises you to say nothing and say it slowly while pr , you go to public early.

Law tells us what we must do whereas ethics tells us what should we do.

This question is for 7 marks..it is worthy to be 7 marks??

can you please give me some more.

THanks in adance.