Would iterations make a good portfolio case study?

I plan on reworking one or more of my portfolio projects. What I have in it now are projects I made in a certificate course and now that I've learned a lot more about WCAG and have learned of more common design practices I want at least one project that showcases that more.

Would creating a new case study for this and documenting my thought process on these changes be good to show as a new portfolio project? Would it be better to just update them and submit them as originals? Or would it be better to just start a new project altogether?

IMO I thought this would be a good way to show growth and that I'm learning. I also thought it would be a good way to show how I go about working on previously created designs (ex, continuing work created by another designer/developer). But I wanted a professional opinion.