Switch in docked mode renders at a native resolution of 1920x1080. Switch in portable mode renders at a native resolution of 1280x720.
Portable mode is also not capped at 30fps and appears to also drop below 30fps at points such as during the scene at 2:58.
I might be mistaken but the game also seems to have the PS4/XB1 visual changes such as the wider field of view.