WBT 0600 vs WBT0644

Has anyone compared if there is any difference between the two wbt banana plugs? I know wbt0644 has 52% copper alloy while 0600 has 62% copper. Has anyone done any comparison in terms of sonic performance and is it worth it to spend that extra bucks to get the 0600 top of the line plugs? Please share your experience if anyone had one.
Both are fine but the 0600 is a top line plug. Depends on the quality of your posts. If your posts are generic (typically gold/nickel/brass), the 0644 is good enough.