Never heard of "king year" but that's not surprising - there's so many OEM and rebrands out there it's hard to keep it all straight. As far as modifying the fan - few things come to mind:
1) Make sure you aren't dramatically reducing total airflow capabilities.
2) If the fan has to be soldered directly to something, do a good job (you may consider just cutting the leads and splicing/soldering into those, vs desoldering from a PCB and re-soldering).
3) If the fan is thermally controlled replace it with one that's also thermally controlled (what I mean here is, some fans actually have the thermal control built into them, instead of an external device that adjusts their supply voltage).
That all having been said, it's likely just a basic 80mm fan that you should be able to swap pretty painlessly, the "worst" thing I've seen doing that on PSUs is some models need a slimmer fan than the conventional 80x80x25 models that PCs use for exhaust/intake fans, which can sometimes be obnoxious to source, but not impossible.