Fans 1,2,3 are Noctua NF-A12x25 PWM, Premium Quiet Fan, 4-Pin
Fans 4,5,6 are Noctua NF-F12 PWM, 4-Pin Premium Quiet Fan
Yes, they are different fans.
But get this: fans 1 and 2 are the same fans set on the performance profile (CPU-not in the image shown). Fan 1 will spin near or over 2k rpm while fan 2 will be stuck at something like 1200 to 1300 rpm.
I'll try and get a picture of this happening.