It's KN, not PN by the way!
But yes, I think it is. I actually wrote a whole thing on it, and the more I see people having trouble acquiring SN, the more I'm tempted to share it.

I'm pretty sure KN tastes quite similar to SN, though of course I can't say for certain. KN is super easy to get hold of compared to SN right now.
I don't believe you need to take a higher dose the more I've looked into it. I thought that at first, but after reading
this study, I think the dosage would be roughly the same as SN. For those under 99kg/220lb, it's 25g; over 100kg/220lb, it's 30-35g. The preparation, storage, and everything else are the same as SN!
I've ordered some and might use it as my main method, even though I have SN. If it can help others, I'd be happy to donate myself lol.
EDIT:
The only research I have found for potentially needing a higher dose is in
this book which says:
Which in dumb people terms means SN is 67% nitrite by weight and KN is 54% nitrite by weight so:
So if the normal SN dose is 25 mg then to get an equivalent dose in KN, you'd need 31mg.