compiling a kernel on a different machine

[Rowdy]

Greetings,

My attempts to compile a (5.1-RELEASE) kernel on a very old PC take 
around 5 hours (of compile time), while a much faster machine sits by 
idle.  It would be great to be able to compile the kernel on the faster 
machine and transfer it to the older machine.

Would I be correct in thinking that the simplest way to do this would be 
to execute the compile AND the install on the fast PC, then copy the 
/boot/kernel directory from the fast PC to the old PC?  I realise I 
would need to rename /boot/kernel.old back to /boot/kernel on the fast 
PC so it would boot again.

Or is there a better way without disrupting /boot on the fast PC?

tia

Dave