The tag alias #74776 living_insertion -> vore is pending approval.
Reason: Here's what the wiki for living_insertion says is the difference:
"While often conflated, living insertion is technically not vore - unlike vore, the goal of a living insertion isn't to fully consume the character; the insertion is oftentimes partial, and it's either implied or explicitly shown that the inserted being will exit from the same orifice."
First of all, that's not TWYS - the vast majority of posts under living_insertion have basically nothing showing that. Secondly, even in the cases where the character truly does exit unharmed - vore includes that! See full_tour, regurgitation vore, rebirth, and just safe_vore in general (though that tag also has issues, but it's certainly vore).
There was one previous thread on the matter, topic #18123. The one counterexample they gave could be tagged vore, and in cases where the insertion hasn't started yet that wouldn't be properly tagged living_insertion either.