ANA ELISA IGEL 

If you have a 1 Project and now have an update to the source files, in theory this gives you 2 Project.

Most would use Perfect Match on 2 Project, leveraging what you can from 1 Project while recognising the source file changes and updates.
But with a freelance license I dont think this is available to you: https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0024812

So all you can do is ensure TM for 1 Project is up to date and apply to 2 Project.

Lyds

Thank you, Lydia, for your input. 
However, what do you mean by "1 Project" and "2 Project"? Is it "Project N.1 and N.2"? ...hehee

By checking the link you sent me, yes, Trados Freelance version provides the updating source files feature.

ANA ELISA IGEL yes 1 Project 2 Project was my attempt to offer an example illustration. In your case, you mention Project N.1 and N.2"

Lyds