Yes the CJ-6 shared the same frame as the M170. The tubs are different along with different fuel tanks and different seats.
There are two easy ways to tell a CJ from a military Jeep. First is the headlights. On military Jeeps, the headlights are recessed into the grill while on CJ's they stick out from the grill. The other difference is the location of the glove box. On CJ's, the glove box is on the passenger side. On military Jeeps, the glove box is on the driver's side between the steering column and the door.
@nokones sorry for the derailment of the thread.