FYI

After having units running from Batch 1 and units from batch 2 I have found a difference in temps and fans speeds from the two batches.
Although I was concerned I'm not to concerned now, just for fan longevity of batch 1 fans.

It all started when I added a batch one unit to my batch 2 setup
Batch 1 Setup https://imgur.com/a/A0KMm1H
Batch 2 Setup not as fancy, https://ibb.co/s9S5NVc

All batch 2 unit temps were 68c-69c and fan speeds 2800-2900rpm constant across the 7 units from batch 2
When I added a batch 1 unit to this the temp was 62c-63c and fan speed 3000-3100rpm (so lower temp with faster rpm)

The question to myself was why is one unit so far apart from the others (originally didnt know it was the batch 1 unit yet)

Through process of trouble shooting I isolated the lower temp unit and swapped the fan for one of the others of the consistent temps and fan speed like the others. I found out that it was not the unit but the fan itself as the lower temp and faster rpm followed the fan from unit to unit.

I further looked at the fans closer and notice a distinctive difference.
Batch 1 (4 units) I got had these fans with smaller gauge wires and a different wiring pattern.

Blue yellow red black
https://ibb.co/GTGwJkH

Batch 2 units had larger gauge wires
Black red yellow blue
https://ibb.co/NZkKXWB

Both fans do have the same order at the plug to the board just different going into the fan. (different brand of fan I take it)

In conclusion the difference between the fans from Batches is quite noticeable so if your seeing this too, here is what I found.