If a label is used in multiple places, editing the label will change the wording on all these pages.
You should look through the source code and change the PHP classes and Twig templates that display the label to make them display a new one.
Luckily, in most cases it is a template file, so you can use the
Webmaster mode to locate the template file and tweak its code.
If it is in a PHP script, you will have to create a custom module and "decorate" that PHP class from your module.