Question

px py and pz orbitals have different energy in p subshell or not

Answer 1

No they all have the same energy. Remember that all the orbitals of a particular subshell e.g. px,py,pz of a shell or all the five d orbitals of a d subshell or all the 7 orbitals of a f subshell have the same energy. It can be said that all the orbitals of a particular subshell are degenerate(of same energy)