Determining version of uninstalled kernel?

[Stephen P. Cravey]

Is there a facility for determining the version of a kernel that has
been built but not installed? I am working on a script to pre-build new
versions of FreeBSD by checking newvers.conf against uname, but i would
also like to be able to verify that the version in /usr/obj is not the
same as in newvers.conf. Otherwise, my script would just continue to
rebuild everything needlessly.

-Stephen