Sure, you can do that. When most people run multiple instances it is usually of the same kind. For example, I copy 'default' as 'server1' and 'server2' and then run those two instances. I actually rarely, if ever, directly run any of the configs that come with the app server, I always make copies and run those.
It seemed like a reasonable thing to do, but confirmation is always nice.
And like you, I'll actually be running multiple copies of "default". I left that bit out for brevity.
I appreciate the response.