Trek DS question
 

I have been looking at the trek ds series of bikes but had a question on the differences from the last couple years. I k know the ds2 is basically what was named the 8.3 and the ds3 was the 8.4 etc. But other than that and the different color schemes between the last few years. The reason I'm asking is I'm looking at a ds2 from 2018. But the lbs has what I believe is a year or 2 old new 8.3. If I can get this at a good price, is they anything better or worse on it?