IDK? But, I heard Assassins creed on Switch has more colors than PS4 base. While PSnow looks worse than base PS4, NIntendo streaming service is Amazing I hear and lesser lag than PSNow running PS3 games While Switch runs smoother ? Maybe its Japans servers ? Would be more accurate If we can tell how American servers run Assassins Creed compared to PSNow american servers for something like Bloodborne?
I would attribute the fact it might have better colors with Streamed content is not dependent on console base hardware, so the version on the Switch is some level of a PC version stream.
The decrease in latency has more to do with Japan's internet speeds running literal circles around Western world internet speeds and consistancy. I imagine this is the larger reason why the Streamable version is Japan exclusive.
PSN:Forevercloud (looking for Soul Sacrifice Partners!!!)