It’s different. They both have pros and cons.
The creator of Space Exploration was hired before they started the Space Age DLC, so a lot of lessons learned from it are implemented in Space Age.
There are tons of great overhaul mods to play though. I’d probably play something else before doing a Space Exploration run because they do share so many similarities it might be better to leave some space between playing them.
Yep. It isn’t even a new thing for proc gen. That’s how it’s almost always done. You use perlin noise (usually multiple layers) to create different areas with different types of content. They just didn’t do this, except for resource patches which are the least important thing to worry about.