I was intrigued by the way the meme only included singers in the question. I think there's a thing that musicians who play the same instrument all sound alike which isn't true.
For instance - I didn't even need to look up to know that that was
Brian May playing God Save the Queen on the top of Buckingham Palace because he has a really round sound on his notes.
A less glorious moment - I was watching the first RDJ Sherlock Holmes in the cinema and made my poor unfortunate friends stay in the hope that the end credits would tell me whose version of Rocky Road to Dublin that was. Now somehow, I'd missed Luke Kelly but John Sheahan's fiddling I'd recognised -
It might be because I was a child string player (cello FTW!) but there is a difference, and it's probably a mixture of pressure on the string, angle on the finger, weight of bow and so on.
I'm going to play an example.
Two very famous violinists playing the Csárdás, which is one of those showboating tunes that everyone plays at some point.
https://www.youtube.com/watch?v=zozUqZch0Vohttps://www.youtube.com/watch?v=lKhWGphCf4E - just ignore the frill at the front, Vengerov can't help himself.
Those are the same tune - arranged differently granted, and with much though I <3 him, a lot of Vengerov showing off - but you can hear how differently they address the violin.