This is going to be a bit of study to get the exact right answer as there are also two different builds of the 2018 27N LX, one early and another later in the year. That extra build date most likely means there were some changes that made some changes which would be extremely hard to notice.
For shopping purposes, it may help to look at the serial number of the RV.
That should be a label near the driver's seat. Note the serial number, not the VIN number and check the 7th digit of that number. If it is 1 you have an early build or 2 for later in the year.
It's part of the folly of the idea that RV are all the same !
So if the details are important, I suggest going to two different sources for reliable info beyond the "sales" info.
One is that label as it gives far more indepth info on chassis things that may change as well as other details.
To read that label, it will help to have a bit of info on how to read it:
This should take you to the owner's manual for all the products:
Find and view the operator manual here by searching for your specific year and model from our list.
www.winnebago.com
The manual itself can often lead to spotting things we need to know! That rarely read thing can actually tell us a lot!
A second site to consider is the parts listing. It is an interactive things that lets you actually zoom, scroll twist and turn to get a view which can be far better than actually looking at the RV, in some ways. You can "see through walls" for lots of details like where and how the plumbing runs! If you are in cold weather often, this can give you a heads up on where pipes may be run, to better judge how quickly they will become a freeze question!
You can also spot where and how to drain things! Any really awkward things in how the plumbing lines run? Does it use a second pump to drain some extra tank that you might not be aware of by a simple shopping trip?
The build date may also indicate some change in the electronics as that is an area which is changing very quickly. Does it have the same audio systems, same TV, or did they change the equipment used to connect chassis and coach batteries together? Old RV use a solenoid that tends to get burned contacts after long use, while newer may use a solid state BIM (BATTERY ISOLATION MANAGER).
One might be able to head off even looking at some RV, if you find something truly ugly?
But much of the details may only be in something as hard to spot as type of fabric.
To really get the true picture of what you are buying, it may be necessary to look at the printed info that comes with new RV, much like we see in car windows! What options, what feature codes were ordered when new?
One item I might question is how the fabric called "ultra leather is working out now. In the 2015 model era, that was a problem as it tended to peel way too soon. Have they worked out the problems or is it still a factor?
But the part listing can help to spot some difficult questions:
catalog.winnebagoind.com
We have lots of info online now but it can almost be more than we can handle! Information overload?
Good luck on the search as it can be a trek at times~!