As far as I know, FIB is the same info from the routing table but should be "reformated into a ordered list with the most specific route first".
Having a look to several FIBs, I ve never seen most specific route first. Following example, 192.168.199.0/24 is before 192.168.199.0/32.
How is this possible?
Switch# show ip cef
Prefix Next Hop Interface
192.168.199.0/24 attached Vlan1
192.168.199.2/32 192.168.199.2 Vlan1