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The 2016 4k version has a digital code and the 2018 4k version doesn't have a digital code. That's the only difference between the two.
I did not notice any difference
no difference
Both have the same visual and sound effects.
I picked up both and can't tell the difference.
Same film but way better picture and quality
The difference is the remastering. The introduction of 4K and Dolby Atmos which enhances your vision and audio viewing/listening experience.To experience the full presentation requires a 4K with Atmos but the plain blu-ray will allow you to taste some.
I had a similar question in mind as well. Besides the reason you just mentioned (audio/video) the only discernable difference I've noticed is that one version comes with the Digital copy so you can download it onto Vudu/Movies anywhere account while the other is simply the 4k & blu ray version.
Yes. The 2018 is newer.