This article shows how slot series keep their identity across releases in...

https://jeffreysinterestingcolumns.trexgame.net/what-does-euipo-say-trade-marks-are-for-in-plain-english

This article shows how slot series keep their identity across releases in thumbnails and small catalog images. It separates a series name from a specific title, and explains why you should check the rules each time, even when the art looks familiar.