Overwriting a Part File

Hello, I have an old part named, for example, PART X. The model is old and an updated version exists but it is called PART A. I want the model from PART A to be named PART X. How do I overwrite the part file for PART X without redoing all my work?

I don't care about the older versions of PART X, if those are lost, it's OK.

Normally, I could just rename PART X. However, when working in PDM, I am unable to have duplicate file names.

SolidworksSolidworks Pdm enterprise Pdm