I have a 2015 42qd but the build was 2014. My control panel is all of the old analog type whereas I think the 2015 build has the electronic control.
The build is typically indicated by the serial number. My Winne serial # has a "T1" in the serial number and that is a 2014 build. The "T2" will be the 2015 build. (Seventh digit number is a 1 or a 2)
A lot of similar items on each but some subtle differences. Mine does not have induction stove top but a 3 burner gas range. Also instead of a 5 gallon propane tank that is detachable I have a 28 gallon propane tank.
As Steve indicated there are two different build models.
Link to 2014 build
Link to 2015 build