Yes, it's possible via kbin.social.
kbin lets you see who voted for what https://lemmy.world/post/3027601
Open any post on KBin. Click the url (x comments) so that the title shows in the URL, and add /votes/down. Eg:
- https://kbin.social/m/[email protected]/t/329561/Is-is-possible-to-see-who-upvoted-downvoted-a-specific-comment/votes/down
- https://kbin.social/m/[email protected]/t/329396/How-many-of-you-are-actually-chatbots/votes/down
The link is also at the bottom of every thread.
For comments, click on "more -> activity".
The URLs are different so you can't just edit the URL, you have to find the post on kbin.social: https://lemmy.world/post/8552850 vs https://kbin.social/m/[email protected]/t/643937
If a kbin.social user comments on the thread you can find it that way (their fediverse link).