IMDB can be discounted, sonarr gets data from thetvdb.com
That said, I feel like thetvdb is wrong too. Normal policy there, when series have the same name, is to add the year to the new series.
So it should be:
- “Grand Hotel”
- “Grand Hotel (2019)”
instead of
- “Grand Hotel (2011)”
- “Grand Hotel”
on thetvdb.com imho.
Then there is the “US” suffix. Probably this is just something the release groups are adding to differentiate between the old and new series.
I don’t know this series so I can’t comment, but thetvdb has a very harsh stance on the name of series etc. So however the original airing network does it, that’s how it will be named, numbered, etc. If you can find “official” evidence that it should be called “Grand Hotel US”, then the name needs to be changed to that on thetvdb.
The exception being the addition of the year to the name of newer duplicate series, which is the most likely scenario. Consider e.g. “Battlestar Galactica” and “Battlestar Galactica (2003)”, which are the original 1978 and, well… 2003 series respectively.
In any case you need to request an alias so sonarr knows that releases called “Grand Hotel US” are for the new series.