Chevy and Jeep knuckles are 100% interchangable. The only difference is the Chevy drivers side is machined/tapped/studded already and will accept a high steer arm.
Not sure why you think you'd have to change any of the outers on the Chevy axle to use it. Carnuck probably confused you as his was a Ford axle. To stay six lug and/or use the existing brake parts and/or go with highsteer he would have needed to either use Chevy or Jeep knuckles.
There is a number stamped on the long tube just to the right (facing the cover) of the diff section which is the Bill of Materials. This will tell you what the original application of the axle was. Get the number and Google "Dana BOM chart" to find one of the many charts used to look up the number.