Where are you located I think camper prices can be location based, ie campers in San Francisco area are going to be generally more than in rural areas. When I was looking for a used camper a couple of years ago, the prices were all over the place, and NO one seem to know about the NADA price guide lines. I came to the realization that generally campers are worth what you are willing to give. If the camper is in good condition, its the floor plan and has the options you want, then its worth more to you. When I was looking I came across ALL kinds of people trying to sell truck campers, some were trying to take advantage, others knew nothing about what they were doing or so it seemed.
Your two scenarios look to be newer units, so condition should not be an issue, again I don't think you can go by the brand model year and it should = a certain price, its what they want out of the unit and what your willing to give, what its worth to you, if you cant come to terms move on.