there is any different if all be NCT218 or all be TMP451 ?
I think your Chain 2 came from a different miner because I have not seen a different sensor on the same miner, both sensors do the same thing but they differ a bit in specs such as the voltage range, I would advise against using different ones.
Also keep in mind that the majority of the time, a temp-sensor error in the kernel log isn't really the result of a bad sensor but rather an issue with one of the chips, it's safe to assume that at least 8 out of 10 times a temp sensor-error is the result of a bad chip, so make sure you check the chips before replacing the sensor.