The impedance of the cartridge has nothing to do with its sound. The information is supplied to assist in setting the cartridge up properly, specifically this has to do with loading. The loading at the input of the phono section is sometimes about 10x the impedance of the cartridge, but this actually depends more on the phono cable and preamp itself, as there is more to it than this 10x rule of thumb.
There are other threads on loading that have covered this, in a nutshell the loading becomes important if the preamp is unstable with RF energy at its input and the cartridge is a low output moving coil.
Beyond that that value of the impedance might be mostly intellectual curiosity.
Now with high output moving magnet, its a different matter. Loading with these cartridges is more critical, and is, IME, never the stock 47K value often specified. Again, the 10x rule of thumb should be explored first.
There are other threads on loading that have covered this, in a nutshell the loading becomes important if the preamp is unstable with RF energy at its input and the cartridge is a low output moving coil.
Beyond that that value of the impedance might be mostly intellectual curiosity.
Now with high output moving magnet, its a different matter. Loading with these cartridges is more critical, and is, IME, never the stock 47K value often specified. Again, the 10x rule of thumb should be explored first.