There’s a lot of noise and disinformation floating out there, here’s the simplest explanation:
The Switch 2 will launch with three different types of physical cartridges denoted by serial numbers to describe their purpose:
LB - The cartridge will work on Nintendo Switch 2 consoles only.
LP - Game Key cartridges in which a digital download is required.
LN - The cartridge will work on both Nintendo Switch 1 and 2.
There’s a lot of noise and disinformation floating out there, here’s the simplest explanation:
This information has been available since the console was announced, why are you waiting until after launch to ask questions?
Yes to both questions.
Answer to both questions is most are.
Largely yes, though there are a number of titles which are currently experiencing issues: Official Compatibility Guide
Yes: Official Guide to Transferring Data from a Switch to a Switch 2