Pdf.js pre-built build version file differences query

[chetanrang]

Our application was using pdf.js version 2.3.200 and we are migrating to 4.3.136

I see the difference in files in pre-built build folder as below because of which my implementation or way of references in my current project may change.
So, can I get to use pdf.js and pdf.worker.js in latest pre-built build version also instead of pdf.mjs and pdf.worker.mjs ?

PDF.JS version - 2.3.200 - https://github.com/mozilla/pdf.js/releases/download/v2.3.200/pdfjs-2.3.200-dist.zip
This pre-built version folder has pdf.js and pdf.worker.js

PDF.JS version - 4.3.136 - https://github.com/mozilla/pdf.js/releases/download/v2.3.200/pdfjs-2.3.200-dist.zip
This pre-built version folder has pdf.mjs and pdf.worker.mjs