Chinese 845 tubes are pretty reliable and sound very close to the original NOS. I have compared the Shuguang 845, Valve Art, TJ, 845 Amperex copies with my own pair of very little used RCA 845 and GE 845. For the last 20 years that I used them, I have never burned a single Chinese 845. The KR is not the same as the transmitting 845 tube. There are quite a few boutique Chinese 845 that sell for $500/pair, but I have not tried.
I say go for the Shuguang or Chinese Amperex that sell for $150-$180, they are bargain and lasted forever. Save the money and buy the best Japanese output transformer that you can afford and you will have a wonderful 845 amplifier.