Some anime and manga series have multiple continuities, such as Fullmetal Alchemist (the manga and Brotherhood follow the same story while the original was only partly based on the manga) and Evangelion (the Rebuild continuity has strayed completely from the original anime, and the manga is completely different also).
I read through this question, but it mostly covers multiple tags for different parts of the same continuity.
So, what I wonder is: Should we have tags for each separate continuity? Such as fullmetal-alchemist and fullmetal-alchemist-brotherhood; neon-genesis-evangelion and rebuild-of-evangelion; and so on? This answer seemed to suggest we should, but no changes have been made to questions pertaining to FMA: Brotherhood; should they be?