how tightly does nvidia-* port have to follow kernel sources

Hi,

Question as subject. System is a traditional non-pkgbase.

A poudriere system, the jail OS version 1500502 has built [0] 
nvidia-{driver,kmod}-470. So:

% pkg search -x nvid
nvidia-driver-470-470.256.02_2
nvidia-kmod-470-470.256.02.1500502

The *host* OS (ie the system that poudriere runs on) is

% uname -KU
1500504 1500504

I'm presuming this probably won't work and the nvidia kmod 
needs to be the *exact* kernel version as the host.
Is this presumption correct?

The system used to have the following in /etc/src.conf [1]
(I'm thinking about re-adding it and removing nvidia from the 
poudriere portslist)

PORTS_MODULES+=x11/nvidia-driver-470

later the line was modified like so:
PORTS_MODULES+=x11/nvidia-driver-470 x11/nvidia-kmod-470 [2]

[0] accidentally added to regenerated ports list by
     `pkg prime-origins | sort | tee portslist.txt`

[1] `man make.conf` indicates this would go in make.conf but
      it works in src.conf too and serves to remind that 'this gets rebuilt
      when the kernel gets rebuilt'

[2] when the port was split into driver plus module
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