it's the same layout, just more option and tools, more entities etc, and yeah, the ablity to trigger multiple things and have near enough everything interact with everything else all needs to be set up in hammer, which looks confusing tbh, there are entites that decide how light and sound are spread out, and the path corners for all the monsters is insanely expanded i do believe.
and the grid size is... ridiculous, seriously, you can't see the edges when you zoom out all the way, it's phenomenal.