Plex Is Unable To Recognize Two Versions Of Same TV Show

You just have to look at how the show is listed on TVDB or TMDB and name it the same way

Change the show folder

i.e.

The Office (2001)
The Office (US) (2005)

Shameless (2004)
Shameless (US) (2011)

Take both shows out, rename the folder and Plex dance ← click