Script defined variables & use in project suites, projects & keyword tests

Hi

I am using a script unit to generate 2 variables for use in a keyword test - chromeProductCode, chromeProductVersion

My question;

do I need to define these same variable names in the variable editor for either Project Suite, Project, or Keyword Test to make them accessible, for use, within the operations defined within the keyword tests?

Cheers in advance.

Simon