I have both versions of the neons. The volt material feels slightly cheaper and smoother on the 2017. It's more like the material they use on most GR air max 90's. Only really noticeable up close. (Lab version was a fuzzy type of material) One nice difference is that it doesn't attract hair, lint, and dirt like the lab version. So it stays looking cleaner and brighter.
The tongue and ankle collar area are a little more padded. As others have said, the insole is a different color scheme. It's also now just a basic style of insole. It's not as thick and rubbery as the lab version and doesn't have the high arch like the lab version.
I know this will be hard to believe, but I swear the cushioning feels a bit softer in the new version. It not a huge difference, but it's noticeable to me. And it's not just because of the new insole. I tried swapping the new insole into my lab pair and that wasn't the difference.
I've worn the new pair a bunch the last couple weeks and overall, I prefer it since it's a little more comfortable and it stays looking cleaner.