What is the difference between nvme0n1 and nvme1n1?

Some systems have a drive called nvme0n1 and others have a drive called nvme1n1, or a system will have both drives, but with different storage amounts. Why? What is the difference between these, and what does it mean that they are named differently? Example from computer 1: lsblk -dno NAME,SIZE,TYPE | grep nvme nvme1n1 8G disk nvme0n1 139.7G disk Example from computer 2: lsblk -dno NAME,SIZE,TYPE | grep nvme nvme1n1 139.7G disk nvme0n1 8G disk A similar (but distinct) question was asked here, with no answers: https://unix.stackexchange.com/questions/711664/why-nvme-device-name-is-nvme1c1n1-not-nvme0n1