Notice how all the reward buildings have the same cyan accents. Each one of them has it. The goods producing don't have it, as far as I can see from the small pictures.
That makes me believe that these buildings are all meant for the settlement, not for our main city. Inno spends great attention to detail when it comes to graphics and theme.
There is another thing to consider: there are more icons for the attitude of the population of the settlement. The population can be "rebelling". That and impediments will prevent players from filling the outposts with tons of goods producing buildings on day one. We will have to earn Neo Winner Plaza's which will provide happiness for the population and they will only come in a trickle.
Neo Zeus is not a golden upgrade of the normal Zeus because it has a different footprint and golden upgrades never expand the footprint of a building. It would also make no sense to have two statues of Zeus in our city. So that goes in our outpost and it will provide an att/def buff, probably exclusively for GR (because the encounters are extremely difficult).
Neo Lighthouse could give a buff to the foundry, ebony mill, etc. that we have in our outpost. These goods producing buildings create guild raid goods. What are those used for? Well, there is a tooltip that says that "a guild raid officer can unlock this difficulty". In GE we need to pay with the guild treasury to unlock a difficulty level. Maybe in GR we'll have to make guild raid goods to unlock higher levels? That would make sense. I don't expect us to use them in negotiating encounters. Negotiations always use the treasury of the player. What else could we use guild raid goods for?