Analogy police alert! No, guitar amps are NOT different, except they're generally mono (Swart does make a stereo one, and there may be others) and there are WAY more of them, and if I think the comparison/analogy makes sense it's simply because it does. 2nd or 3rd order harmonics, Class A or A/B...tube or SS rectifyer...hand wired or not, tube rolling maniacs...same damn thing really, with some practical differences of course...you can't find many hifi amps with spring reverb or cowboy tolex, so there's that. Mesa Boogie made that insane Baron amp and people liked it...who knew?