Star Trek: Voyager beat them to the punch 18 years ago with its series finale? The parallels are pretty surprising.
Endgame concluded the story started in Infinity War by jumping forward in time five years to the aftermath of travel back in time, grab the Infinity Stones and undo the Snap, it's no surprise the remaining team jumps at the chance. They succeed, with relatively few casualties, and by the end of the movie, things are (largely) set right. Fans of the Star Trek: Voyager series finale - also titled "Endgame" - might have found the story very, very familiar.
As pointed out by Mike Stoklasa on a recent episode of Red Letter Media's "Pym Particles - to guard against tachyon radiation associated with time travel.
Whether the two stories share the same time travel logic will depend on your perspective, but they operate under similar, anti-Back to the Future rules. When Janeway goes back in time in Star Trek: Voyager, she induces her past self to make a different decision which seems to result in a new timeline for the Voyager crew, but doesn't make iral Janeway disappear start a time loop. It's not quite as neat and tidy as what Banner and the Ancient One chat about regarding separate realities, but its's pretty clear Janeway and the Voyager crew created an entirely new timeline rather than erasing an old one.
In a less direct correlation, it's worth pointing out that as villains, Seven of Nine and Nebula both exhibit the same kind of Stockholm Syndrome toward the Borg Queen and Thanos respectively, and their fight for hard-won independence is a key element in both of their journeys.
In all seriousness, the Tale of Two Endgames isn't anymore more than a series of fun coincidences between two properties that are pretty genre adjacent. But that doesn't mean it's for nothing. After all, many fans are still holding out for the MCU to adapt that X-Men/Star Trek: The Next Generation comic series one of these days.
