Use a ruler to measure the slot where the paper sits. It will almost certainly be either 58mm or 80mm. Check for "Thermal":
The V5 board often replaces older V3 or V4 boards in the same laptop shells. It sometimes offers slightly improved thermal management or different connector placements.[1] PCB Schematic Overview on Scribd . k19s-mb-v5
While designed with Windows 10/11 IoT Enterprise and Linux (Ubuntu, Debian, CentOS) in mind, the K19s-MB-V5 also runs specialized systems like Android x86, FreeBSD, and even lightweight ESXi (vSphere) for virtualization experiments. Use a ruler to measure the slot where the paper sits