It could depend on the ambient space around the sensors. The pumps may have electronics near the sensor, I don't know, but it really doesn't matter.
What would interest me most is temperature change over time, so pick one and go with it (maybe the calitemp because you paid for it)
You can also apply a bias to the sensors so they read the same.
It is the same with flow sensors, the exact accuracy is not as important as monitoring change over time.