Switching from producing one part/product to another is generally known as a changeover.
Comments: This switching or Changeover process may involve removing and replacing dies from machine beds, removing and replacing unused materials such as changing from corn to wheat in a food hopper, black plastic to white plastic in an injection moulding bin, etc.
In Lean Manufacturing terms changeovers are best accomplished through SMED “Single Minute Exchange of Die.” Which strives to complete a changeover in under 10 minutes.