the concept of natural justice and the concept of fairness are two
different things.discuss?

Natural justice is a larger concept; it incorporates fairness as a principle.

"The doctrine of natural justice is founded in the notion that logical
reasoning may allow the determination of just, or fair proceedings.
Natural justice has become a legal term of art, especially in
administrative law. Natural justice includes the notion of procedural
fairness and may incorporate the following guidelines:

A person accused of a crime, or at risk of some form of loss, should
be given adequate notice about the proceedings (including any
charges).

A person making a decision should declare any personal interest they
may have in the proceedings.

A person who makes a decision should be unbiased. 

Proceedings should be conducted so they are fair to all the parties. 

Each party to a proceeding is entitled to ask questions and contradict
the evidence of the opposing party.

A decision-maker should not take into account irrelevant considerations. 

A decision-maker should take into account relevant considerations. 

Not only should justice be done but it should be seen to be done; in
other words, legal proceedings should be made public."

http://encyclopedia.thefreedictionary.com/Natural%20justice