Can the cluster IP be changed after FW go live

[Huaming]

Hi, I made a mistake, the cluster IP of FWs and the FW host IPs are not in same subnet. the cluster IP is  virtual IP of the port 0/1, which is our WAN exit also. the FW Host IPs are the actual IP for port 0/2, which is our LAN interface. We also built a IPsec between port 0/1 and 3rd party at external Internet. I'd like to check 

- can this cluster IP be changed to virtual IP of port0/2

- if can, any impact to our existing IPSec VPN tunnel. And How I get it changed to virtual IP of port0/2.

Thanks.