A Cartridge will be retipped normally, sometimes the Cantilver can be replaced, too. When you want the identical sound, you need a specialist who knows what kind of Diamond was used originally, same for Cantilver replacement.
But when the rubber inside is weak, then it is done definitely, because only the Designer knows what rubber was used, the specifications in general...that really is his own Knowledge and normally he keeps it private.
A retipped Cartridge can sound better than before (when better parts are used or when more time in alignment was invested) or worse. At my time with Miyabis and based on the Information from that time, Takeda did indeed a kind of voicing (all do that, more or less). When you have the chance to find a Cartridge Maker in Japan, I guess, that one could know Miyabis better than others...but most don't speak English, they communicate very often via another Person.
But when the rubber inside is weak, then it is done definitely, because only the Designer knows what rubber was used, the specifications in general...that really is his own Knowledge and normally he keeps it private.
A retipped Cartridge can sound better than before (when better parts are used or when more time in alignment was invested) or worse. At my time with Miyabis and based on the Information from that time, Takeda did indeed a kind of voicing (all do that, more or less). When you have the chance to find a Cartridge Maker in Japan, I guess, that one could know Miyabis better than others...but most don't speak English, they communicate very often via another Person.