short answer: NoI was watching Tyll's review on the 650/ 600 the other day. He said the 650s are a bit more "resolving." What does "resolving " mean in this case? Many others say the 600s are a touch "brighter." Aren't "more resolving" and "brighter" the same thing?
You can usually find the definitions here: https://www.head-fi.org/articles/describing-sound-a-glossary.12328/
and here: https://www.head-fi.org/articles/glossary-of-terms.13562/