There is -6db between them and what happens is there are plenty of videos out there showing you home uses using low wattage versions of the big brother amps and getting tones that some big brother owners claim you can't get. What it comes down to is volume, not tone and this little bit of different low-end which gets chopped in the mix.
Just go listen to any Marshall JCM800 vs Marshall SC20h comparison videos or 50W vs 100W EVH5150III. The idea there is significant difference a home user needs to worry over is really a nothing burger.