Focal-JMlab Cobalt 806S or Chorus 706S

Hello group, I am thinking of buying the Focal-JMlab Cobalt 806S, will it be a big difference compared to the Focal-JMlab Chorus 706S? I currently have a Totem Acoustic Rainmaker paired with a Krell KAV-300i and a Burson Audio Swing DAC, but it has a very bright and strident sound. I've already tried other DACs and amps and they cause the same fatigue,

I have a Focal-JMlab Chorus 706 (not S) and I like their sound better, they don't fatigue, I wanted to upgrade to Focal-JMlab Chorus 706S or Cobalt 806S, is there a lot of difference between them ?, thank you.