Which is correct: Ramadan Kareem or Ramadan Mubarak?

What is the difference between Ramadan Mubarak and Ramadan Kareem?""Metro.co.ukRamadan 2019: Mubarak Kareem quotes - Happy wishes, greetings and poems""Express.co.ukRamadan Mubarak: Ramzan Images, Cards, Greetings, Quotes, Pictures, GIFs and Wallpapers""T