Never remove the old modules. Overwrite them. That’s what deleted video. Also, if you get the wrong module directory, you’ll remove things you definitely don’t want gone. Add to this that it is best to keep a copy of the original kernel and modules in place in case things don’t work out.
You might find this of interest regarding CONFIG_LOCALVERSION and setting it to “-tegra”:
https://forums.developer.nvidia.com/t/kernel-customisation-jetson-orin-nx-bsp-install/262647/12
As a short answer, that’s how the modules were compiled in the original install. You can’t reuse the original modules if the configuration does not match and it causes the kernel to look for modules in the wrong place.