I applied to CLS/Chi quite a few times about 3-5 years ago, last time in 2019-2020 cycle.

I used PS-1 the first time and a different PS-2 in later apps over a few years.

Since then my score has expired and I retook this Oct.

All my other application material (Recs, Resume etc) is pretty much the same. I can't get another rec from elsewhere.

Is it ok to reuse the PS, or do I need to write an entirely "fresh" one?

What if I reuse PS-1 which wasn't the latest PS i reapplied with earlier, how much difference would it make compared to writing a new one?