Castle...

In general, yes. If the domains are hosted on the same server with the same set-up, then it's fairly "easy".

Just download the entire GBomb/BlogBomb folder, then install on the new domain.

There will be a few file paths that need to be changed, but that's about it and any data used on the first instance, such as RSS pheeds, will be duplicated on the second domain.

Note: Don't forget about ZZ Tuel, which often will be a better option for multiple domain building and managing.