bluetooth kernel to bluez userspace relationship

All,
I'm new to bluetooth so please forgive me for asking this question if
its already been answered. I understand that the linux kernel has part
of the bluetooth stack and there is also the rest of it called Bluez
in userspace which consists of a daemon and library. How would one
correlate linux kernel version with the bluez userspace version?
Meaning, how would l know say, linux-2.6.35 would work with
Bluez-4.68.

Any response would be appreciated.

Thanks
Vish