There is little difference between most AIB cards ... exception being the EVGA SC series which is basically just a reference PCB with an improved cooler. Rarely does a manufacturer send out every card in their lineup for testing so finding a review of every model is a difficult task and even if you did, comparisons between different sites on different test beds, with different tests would not be comparable.
Normal;ly they will only send out their 'flagship" card and sometimes another. here's the review on the Jetstream.
https://www.techpowerup.com/reviews/Palit/GeForce_GTX_970_JetStream/29.html
Here's the test results idle / Load for all 970s tested by TPU
MSI GTX 970 Gaming 43°C 63°C
Colorful GTX 970 iGame 28°C 67°C
Palit GTX 970 JetStream 49°C 78°C
ASUS GTX 970 STRIX OC 47°C 71°C
EVGA GTX 970 SC ACX 35°C 73°C
NVIDIA GTX 970 33°C 77°C
Most of the folks we have built for chose the MSI
You just can't look at the number however because:
Higher factory OCs mean higher temps.
Lower temps mean higher noise ... each vendor makes a judgement call on whee to set the default settings to prioritize one over the other.