If you are looking for a comprehensive overview of what this specific update entails and how it fits into the "portable" experience on the Switch, here is a complete breakdown:
Install via your preferred title manager (Tinfoil, DBI, etc.). Option 2: Short & Social (Discord/Telegram) Assassin’s Creed III Remastered assassincreediiiremasterednspupdate102r portable
The title ID for this update on Switch is 01007F600B9AA800 (US version) or 0100F1000D28A800 (EU). The version string v102 corresponds to the internal 1.0.2 . Those running CFW can verify this in their title manager. If you are looking for a comprehensive overview