For instance, this one (link to a post to !memes@reddthat.com): https://reddthat.com/post/20260613
Pasting it in your search bar should give you this kind of results:
You can then click on it to access the post from your instance (in this example, lemmy.zip: https://lemmy.zip/post/16918691)
The Lemmy Universal Link Switcher is awesome
Wow, that script is incredible. Thanks for sharing! You’ve saved me several minutes per day!
I love how it adds a button to view the original link as well.