Question

What is difference between Fleming 's left hand rule and Fleming 's right hand rule...?

Answer 1

 1) Fleming's left hand rule is used to find the direction of magnetic force acting on a charged particle moving in a magnetic field, or a current carrying conductor kept in a magnetic field. 

2) Fleming's right hand rule is used to find the induced current in a coil encountering a change in a magnetic flux with time
. 
so, the rules are different and used in different contexts.

Answer 2

 1) Fleming's left hand rule is used to find the direction of magnetic force

2)Fleming's right hand rule is used to find the induced current in a coil