When it released in summer 2013 for the PlayStation 3, it sold [6 million copies] within almost a full year after release. By 2018, two years before The Last of Us Part II, the first title sold [18 million copies] across the PS3 and its PlayStation 4 remaster.

As of June 2022, The Last of Us Part II for the PS4 reached [10 million copies] since its summer 2020 release.

Part I sold 18 mil. 6 mil the first year and 12 mil the next 4 year.

Part II sold 10 mil over 2 years.

Maybe you can find a more up-to-date sales figures but usually the second game out paces the first game.