No, the voicing of the amp plays a big part in how loud you may perceive it to be.
If a louder sound is masking the voicing it won't sound louder anymore. If you can't hear the voicing you will not have the perception that it's louder.
Louder sounds mask quieter ones.
Any band who plays in a bar and get's the "Bands too loud turn down" only to get outblasted by a margarita in the blender has experienced this.
Acoustic power is most important.