kernel from 1 box to another

[Tom Brown <tom@xxxxxxxx>]

OK this is potentially a dumb question but....

If i build and install a kernel on box a can i just tar up the 
vmlinuz-xxx initrd-xxx and the built modules from box a untar them on 
box b and update the grub config? If not is the only way to build a 
kernel on one machine and dictribute it to other boxes to package it up 
as an rpm?

thanks