The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at You Know, That Thing Where.
Sounds in part like Older Than They Think to me.
Everything can be found on the Internet... except common sense.
With a touch of Weird Al Effect
No, not Older Than They Think, because the more popular work is definitely a follower. And the follower doesn't eclipse the popularity of the original... it just becomes more popular.
For example, Captain Marvel was created as an Captain Ersatz of Superman because his publisher wanted to cash in on the brand new superhero craze. Despite this, for a while in the 1940s, Captain Marvel outsold every other superhero title being published, including Superman, the character he was based on.
Do we have a trope for that?
Being in a Japanese-produced work is not enough of a difference to warrant its own trope.
Adaptation Displacement?
More Popular Spin-Off could be what you're after.
Is there an extant trope for a work that originally was created as a Follow the Leader, but whose quality and/or popularity eventually led the follower to outsell/be more recognized/what have you the original work, even if temporarily?