Difficulties to match that series are to be expected, considering that they both aired in the same year, and their titles only differ in the second half.
Plex has a mechanism for this kind of situation.
/TV Shows
/ Grand Maison Tokyo (2019) - {tmdb-95718}
/Season 01
Grand Maison Tokyo - s01e01 - Red Shrimp Étouffée.mp4
...
Keep the agent of the library at “Plex Series”. Don’t change it willy-nilly, it won’t do any good.
Rename your folders like above, then perform the Plex Dance with the whole show.
