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/fediverse@lemmy.world/t/329561/Is-is-possible-to-see-who-upvoted-downvoted-a-specific-comment/votes/down
• https://kbin.social/m/asklemmy@lemmy.ml/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/fediverse@lemmy.world/t/643937

If a kbin.social user comments on the thread you can find it that way (their fediverse link).