Differences between Challenging Sandbox starting plots and FL starting plots? - answered

[Artificial]

After finishing FL starting plot I solved to try Challenging Sandbox starting plot, Lost TerraCorp Pilot to wit, but wanted to knew answer to few questions before starting. Can anybody help me with them?
1. Does Challenging Sandbox plots have differences with FL starting plots except no access to starting FL story plot and way to obtain HQ, Hub, LFL and HSAP? Will that start have access to future story plots like Terran plot or potencial future plots?
2. Does Xenon Hub or HQ have differences in functionality between that groups of starting plots?
3. Will game universe differ in no access to certain systems like The Void and etc?
4. And are there any another differences or nuances that I should notice before starting?

[Cycrow]

1. There are no difference other than the main plot is not in the sandbox starts, and how you get the HUB/HQ is different
2.They are the same in all starts
3. The universe will differ slightly each time you start a game, but the start game your choose doesn't effect this
4. The sandbox starts should be pretty much the same as the plot starts once you have finished the plot and opened up the universe

[Artificial]

Thanks for comprehensive answer!

[Kosevich]

There is one minor difference.
In main plot dynamic relations are offline, so you can advance your notoriety with almost all factions pretty high.
In sandbox or challenging sandbox starts dynamic relations are enabled from the start.