this is from the link Mamyalynne provided, if it's any help
Both Olympic and Titanic had 15 portholes on the starboard side of the forecastle on C-Deck. On the same area on the port side, both were launched with 14 portholes. However, Titanic was modified before she sailed to have 16 and Olympic received the same modification after Titanic was gone. As proof, go to Google Images and find an image of Olympic (it’s the ship without the enclosure on A-Deck which is just below the Boat Deck) with 16 portholes on the port C-Deck of the forecastle without lifeboats going along the full length of the Boat Deck. Olympic received a full complement of lifeboats practically immediately after Titanic sank