You can restrict the face_lattice poset by using the subposet method to restrict the poset to elements corresponding to 0-faces, 1-faces and 2-faces as follows: if P is your polytope, you can do:
sage: PP = P.face_lattice()

Then, if you do the same with another polytope Q, you can then check:
sage: P2.is_isomorphic(Q2)