If a ship's parts were changed what type of ship would it be?

There is not enough information in the question to give an accurate answer. If a ship goes to the shipyard and has changes made it is called a "Shipalt" meaning a ship alteration. It also depends on what work is being done. Some work is just upkeep and some work is for a refit or to change the mission of the vessel. In the Coast guard there was a 180ft buoy tender that went to the shipyard and after extensive changes it became a research vessel.