While the structure of late-war Japanese planes was undeniably more rugged than that of the Zeke, they still could not quite match the ruggedness of American aircraft such as the Hellcat, Corsair, or Jug. These U.S. aircraft were classified by the Japanese as heavy fighters, while the Frank and George were considered to be middle-weight fighter aircraft.
Pilot armor was another area where some Japanese fighters fell short. The N1K2 George, for instance, had no pilot armor. With the exception of bullet-proof glass in the front pane of the canopy, pilot protection was of the passive variety and could not compare to that of American aircraft.
I have no data about the pilot protection provided in the Frank or Jack.