TO me "using the same domain name for multiple servers" means that you have 2 servers, and you want them to share the load of one domain name.
So some people typing example.com will end up on one of them and others will end up on the other.
A cheap form of load balancing - good for static content but not so good for dynamic database-driven stuff like forums.
If this is really what you're trying to achieve, simply put A records for both server IP addresses into the NS data for the domain name.
If that's NOT what you want, you need to explain yourself better.