Changing the VS IP of DR Site to Production IP

I still don't quite get your environment, do you perhaps a drawing?

You write about a production and disaster recovery IP, are those for virtual servers or self IP addresses of the BIG-IP?

I sort of expect something like this.

There is a production BIG-IP with virtual server with IP address 192.168.10.10. You want that same IP address on the disaster recovery BIG-IP so that if the production BIG-IP fails you can enable it on disaster recovery BIG-IP. For that to work you would have to add the 192.168.10.10 virtual IP on the disaster recovery BIG-IP but disabled and not responding to pings. Then afterwards you can add the rest of the virtual server configuration.

One question I still have is why the setup with a production and disaster recovery BIG-IP? Create a cluster and you have a way better way to handle one system breaking down.