How to pass one value from one suitescript to another suitescript?

Which script types are you talking about?

From suitelet, I have create a suitelet script to authorize and get access token and refresh token, I want to pass both value to another suitelet that refresh the token and get another access token and refresh token

Add parameters to the suietelet you are calling and when you call that suitelet provide the parameter values.

Using sourcing and filtering?

That makes no sense. Navigate to the suitelet in the UI and add new parameters. Make a note of the ids (you should specify the id's as you create them). You can then use those id's to make a call to the SuiteLet as parameters

Afaik, the suitelet only get not set the parameter

You send the parameter values in your POST to the SuiteLet or as url parameters for a GET call...

Could you extract all of the token logic into a custom module, and then have both Suitelets call the relevant functions within the module, rather than trying to call each other? This is typically how I've managed tokens with external APIs previously.

This process is demonstrated using dependencies in my GitHub template. It may help to check this out and establish your connection between scripts this way. Or you can look at script parameters to pass values when you scheduled using the task module. https://github.com/devnetkc/NetSuite-CustomModules-Template