You don't need to copy paste the entire config.
Active CSM config will syncronize the config to standby CSM automatically.
You just need to put the Interface & FT (fault tolerance) related config on standby and Active CSM will copy the config to the Standby.
Interface & FT level configs on Active and Stdby should look like this
******** Active CSM *************
module ContentSwitchingModule 3
ft group 1 vlan 101
priority 110 alt 100
preempt
!
vlan 100 client
ip address 10.10.100.2 255.255.255.0 alt 10.10.100.3 255.255.255.0
gateway 10.10.100.254
alias 10.10.100.1 255.255.255.0
!
vlan 200 server
ip address 10.10.200.2 255.255.255.0 alt 10.10.200.3 255.255.255.0
alias 10.10.200.1 255.255.255.0
...
...
...
remaining config...
*********** Standby CSM ******
module ContentSwitchingModule 4
ft group 1 vlan 101
priority 100 alt 110
preempt
!
vlan 100 client
ip address 10.10.100.3 255.255.255.0 alt 10.10.100.2 255.255.255.0
gateway 10.10.100.254
alias 10.10.100.1 255.255.255.0
!
vlan 200 server
ip address 10.10.200.3 255.255.255.0 alt 10.10.200.2 255.255.255.0
alias 10.10.200.1 255.255.255.0
Thanks
Syed Iftekhar Ahmed