Updating/patching network card driver?

[Nomad]

I installed FreeBSD 6.2 on my computer but the network card (bge) wasn't
detected properly.  On troubleshooting the problem I found the driver for
this family of NICs isn't appropriate to my particular release.  I would
prefer to stay with the RELEASE branch but found an updated
driver.  In updating the driver, is it sufficient to replace the
contents of  /usr/src/sys/dev/bge  with the updated version and then
rebuild the kernel?