I can use industry to prefab ship components. I can then construct a ship using a shipyard. Because I already used industry to prefab ship component, my shipyard will construct the ship faster.
I can construct a ship using a shipyard. I can then use industry to prefab ship components. When the ship components finish, will the time left for construction of my ship using the shipyard be reduced as though I had used industry to prefab the ship component ahead of time?