this is a weird situation but I am on holiday and left my nintendo switch at home. however, my sister brought her switch and I borrowed it to play some Pokemon violet. I also have Pokemon violet on my switch and logged into my nintendo account. I have different save data on each console. if I insert my sisters cartridge of Pokemon violet into my nintendo switch, will it load the save data from my sisters nintendo switch or the save data from my nintendo switch?
Since save data is stored on the switch/SD card and not the cartridge, it would load the save data on the switch for the associated user.
Source: I own many copies of the same games, and tried this myself a while back