Would a stereo Sim Audio Moon 861 amp be as powerful as 2 McIntosh 611 monoblock amps?

It’s hard to know because of AC current measurements in addition to wattage rating of a amp. I was wondering... would a single stereo Sim Audio Moon 871 amp (300 watts 8 ohm/ 600 watts 4 ohm) stereo amp play as loud as 2 McIntosh MC611 monoblocks (600 watts at all ohms) without losing sound quality or struggle? For speakers, it would be Focal Sopra n2s or Dynaudios of similar tier. I'm thinking about 85 decibel level.