Yet another post about internet fiber in Omaha

I see that fiber work is being done again in the neighborhood for another internet provider. Question for the network engineers out there (or those in the know): can the provider's fiber (probably Google in this case) be simply fished through the conduit that Fiber First laid last year, or does separate conduit have to ditch-witched (again) into the ground? Saw a not-so-small pile of dirt next door as they start on this street. If there is no such thing as conduit when it comes to internet fiber, then shows you how much I know.