Thank you for your question. Depending on how old your faucet is, you can replace your trim without replacing the valve. If your valve was installed after 2006, you will probably have the multi-choice valve in the wall. If this is the case, you can install any of our 1300/1400 or 1700 series trims in your wall.
If it was installed prior to 2006, you can only use the 1300/1400 series trims but you will need to keep your old cartridge. The cartridge that comes with your new trim will not work with the old valve.