You cannot have two processes associated with the same IP address. You can add another IP address to the field and each server listen on it.
Another option is a proxy to transfer one server to another. With Apache, you can do something like:
NameVirtualHost *
<virtualhost *>
ServerName other.site.com
ProxyPass / http://127.0.0.1:8080/
ProxyPassReverse / http://127.0.0.1:8080/
</Virtualhost>
, ProxyPass. , , , , 127.0.0.1 IP- . - (apache mod_rpaf) X-Forwarded-For IP-. , CherryPy ?