replacing dead power supply / psu

PSU on very old Dell Optiplex 390 desktop conked out.

I confirmed it's just the PSU that needs replacing by temporarily switching the power supply from another old computer into the Optiplex. But I want to return the working PSU into the original computer as I still have a need for both machines.

Just wanted a little guidance on options to avoid getting the wrong thing.

Old PSU is the original Dell branded H265AM-00. A prelim search suggests Dell doesn't carry an exact replacement on it's site anymore. So, looking at Amazaon found the following:

Odd brand (LXun) that touts itself as being a replacement for the Optiplex 390, and is similarly low powered as the original 265W unit for $33.95:
LINK

An Apevia 600W unit for $33.95:
LINK

I'm not running a video card, and the cheap, original 265W unit ran fine for a decade plus, so the LXun appears adequate. However, the more powerful Apevia, which also has circuit/overpower/underpower/ protections seems way better for the same price.

So, the only question is really if there's any potential downside / compatability issues with using what looks like a more modern Apevia PSU in an older machine. To my inexperienced eyes, it looks right... has the 20 pin power to the mother board plus the 4 pin to the mother board, has adequate SATA and 4 pin molex peripheral power connections... just don't know if SATA standards, etc. have evolved over the last decade in a way that affects compatability with a plain old SATA internal drive that's several years old.

I have limited experience with component replacements, so just trying to be thorough instead of assuming it'll work. Any thoughts would be appreciated. Thanks