SBS 2003 R2 – Can Two SBS Servers Share The Same ISP?

I currently have a SBS 2003 R2 network in place in our office. It’s running great. I need to use the same ISP and firewall to temporarily setup another SBS 2003 R2 server with a different domain name for configuration purposes only. I have 5 statice IPs. Can this be done? The second server will be moved to another office once it is configured. Any help will be appreciated.