Especially acoustic string instruments, regardless of measurements, sound vastly different. And measurements, as in HiFi, only tell part of the story. They do not measure tone. In guitars (or violins), the artistry of the builder, method and materials have a great impact on tone. Brazilian rosewood has acoustic properties that make it vastly better sounding than East Indian rosewood. All woods used have a great impact on the ultimate sound. And the of the age of the cut is also significant. The older the better. Especially the age of the finished instrument. Eg.; a 1930s Martin Guitar can sound amazingly good and can sell for hundreds of thousands, mostly, because of the tone. Not to mention a violin of a great builder that is hundreds of years old! A new guitar, or violin, can also sound good but the tone will open up with playing. All these instruments will improve in tone the more they are played. This is also a central factor in old instruments. In comparison, quality of Audio gear is certainly dependent on skill, method and materials. But, aside from the break in, age can wear our certain elements like caps and bearings. However the “ear” of the builder is central to the ultimate tone of the component.
And, as said, the measurements only tell part of the story. They cannot measure the tone.