According to the top-voted answer in the meta post Rules for multiple media using the same name:
if there are two films (or TV shows) with the same title, they should both (or all) have dates on the tags.
In line with this, I propose that the existing tag mulan (currently used for the 1998 animated Disney film) be renamed/merged to mulan-1998, since there is a 2020 live-action Disney film with the same name, "Mulan" (which has the mulan-2020 tag).
By appending the release year to the tag, it will help differentiate between the two films and maintain clarity when discussing or referencing either version of "Mulan".