You can tell they're all the same pretty much by comparing the options/standards lists. They all list electric awning, built in medicine cabinet (well, not the 17A), frameless windows, etc, etc. Plus, when ETI posted and announced the new style they didn't say "well, this is true for the 19 we're showing you the photo of, but the others will look way different". Or words to that effect. Nope, he said this is what it looks like and here's some of the options/standards on it.
Nor was anything said to me in person when I was up there a few weeks ago taking photos of the new 19', neither when I talked to Tammy or Reace. I talked to both of them about changing our order to the new 2017 model and neither said 'well, what you're looking at here is not what you're gonna get". That would have been the time to say that.