Constitutional body is the body that has its name mentioned in Indian constitution. It derives power directly from the constitution.
Any type of change in mechanism of this body needs constitutional amendment.
Example: UPSC, Finance commission, National commission for SC/ST etc.
Non Constitutional Body:
It is a body which does not find its name in the constitution of India. Hence, it cannot derive power from constitution of India. Statutory body can also be called as a non-constitutional body.
It is a non-constitutional body. This body is created by statute i.e. act of parliament.
A cabinet resolution can be passed to establish this body. It has to rely upon its statute to derive power.
Ex: Planning commission, National commission for OBCs, SEBI etc.