I seem to have a System76 kernel on a non-System76 workstation

[mahesh]

As the title suggests, I've discovered that the Linux kernel I'm using on my (non-System76) desktop workstation is a System76-built kernel:

$ uname -sr
Linux 5.4.0-7642-generic

The current version of the (non-System76) 5.4.0 kernel is 5.4.0-92-generic.
(Though it looks like it will be upgrading to something newer soon, as kernel security updates are apparently being rolled out right now.)

Kernel version 5.4.0-7642 doesn't exist anywhere in the Ubuntu kernels builds.

The closest I can find about kernel 5.4.0-7642 is this: https://launchpad.net/~system76/+arc...build/19851655
Which is a System76-built kernel. (And also very old by the looks of it.)

I did recently have a System76 "Wild Dog" desktop computer dating from 2010. I pulled this SSD from that computer not long ago and put it into a new computer. This must be where this "leftover" kernel is from (even though I re-formatted the drive and fresh-installed 20.04 Linux-MATE.

My questions:

Does it make sense to keep the 5.4.0-7642 System76 kernel on a non-System76 machine?
Could there be hazards to doing so?
What kernel would it make sense for me to move to, or upgrade to?

I'm running the Ubuntu-MATE 20.04.3 LTS OS.