My desktop has a NVidia GTX 1060, I use the proprietary driver from the nvidia
repo and recent Tumbleweed.

The drivers kernel modules are version is
nvidia-gfxG04-kmp-default-390.25_k4.15.2_1-10.1.x86_64, the kernel (TW
20180221) is 4.15.4-1-default. 

For checking some other issue, I had rebooted to the previous kernel
(4.15.2-1-default) today.  The drivers wouldn't load. 

I have
/lib/modules/4.15.2-1-default/updates/nvidia.ko
/lib/modules/4.15.4-1-default/weak-updates/updates/nvidia.ko ->
/lib/modules/4.15.2-1-default/updates/nvidia.ko

However,

modinfo /lib/modules/4.15.2-1-default/updates/nvidia.ko
filename:       /lib/modules/4.15.2-1-default/updates/nvidia.ko
alias:          char-major-195-*
version:        390.25
supported:      external
license:        NVIDIA
srcversion:     B5B1CA3087B567ADFADC070
alias:          pci:v000010DEd00000E00sv*sd*bc04sc80i00*
alias:          pci:v000010DEd*sv*sd*bc03sc02i00*
alias:          pci:v000010DEd*sv*sd*bc03sc00i00*
depends:        ipmi_msghandler
retpoline:      Y
name:           nvidia
vermagic:       4.15.4-1-default SMP preempt mod_unload modversions 

or
strings /lib/modules/4.15.2-1-default/updates/nvidia.ko | grep 4\\.15
4.15.4-1H
/usr/src/linux-4.15.4-1/include/linux/dma-mapping.h
/usr/src/linux-4.15.4-1/include/linux/dma-mapping.h
......

Seems it was compiled using the 4.15.4 kernel tree, but installed in the 4.15.2
modules directory?

No manual compiles etc., just using standard 'zypper dup'