Replacement cards rules

By Erny, in Star Wars: The Card Game

Is anyone alive? There were questions about these cards, which appeared at the end of the game.
https://www.fantasyflightgames.com/en/news/2018/5/7/a-grand-farewell/
I didn't clearly understand how I could add them. Suppose I have a deck of 10 objective DS.
1. Can I add 1 Darth Vader to only one of two identical objectives?
2. Can I add Darth Vader to each objectives (so that there are 10 Darth Vaders in the deck)?
3. Can I add Darth Vader (Sith) to (Imperial Navy) or (Scum and Villainy) objectives?