you can change tx crystals in fm radios right??
As soon as you remove the crystal from the TX you're technically breaking the law. Practically speaking this is absurd but it's good practice to have a crystal tuned for the transmitter it's in. Thing is I doubt even someone certified to do crystal changes bothers retuning for a single channel change. It's more about liable than anything else. If you do it and something bad happens it's your fault. If you don't and something happens it's not your fault. Your choice weather you want to take the chance.