Will games look 'cleaner' on 1080p screen using a PS4 Pro than a standard PS4 because of downsampling from 4K?

Is downsampling similar to MSAA/anti-aliasing effects on a PC?

I was looking at PS4 Pro Horizon: Zero Dawn screenshots and it looks a lot more natural when it was just outputting at 1080p:

4K: http://ift.tt/2cJpFKC

1080p http://ift.tt/2t6wwXL

You can see less artifacts and general fuzziness when zooming in.