There is no cut and dry answer. It depends on the cartridge, who is doing the service, and what their retipping service includes. It can be done cheaply and/or badly and change the original cartridge for the worse, or it can be done very well at greater cost (e.g. in the case of Lyra or Dynavector factory rebuild service) and result in something the same as the original and possibly even better.
There is no one good answer to such a general question.