A kernel is, among other things, a mass of hardware drivers. The latest kernel is only needed if you are on the latest hardware that require those drivers be compiled into the Linux Kernel.
I cannot say if your hardware will work with the 5.15 kernel, but if your hardware is older than a year and a half, it really should work fine.
You can try it:
sudo apt install linux-image-5.15.0-83-generic linux-headers-5.15.0-83-generic linux-modules-5.15.0-83-generic linux-modules-extra-5.15.0-83-generic
Reboot but access the Grub Menu. You may need to tap esc or tab (EFI Boot) or hold left shift key (MBR legacy boot) as you pass the motherboard splash screen to show the grub menu.
In the grub menu, select Advanced Options for Zorin and then select the Zorin on 5.15.0-83 kernel to boot up (Not the one marked as Recovery).
Once booted, take your time to test everything including the ethernet.
If everything works, you can set it to default boot.