Bought two Eizo S2433W, different UDACT test.

[sblantipodi]

As title,
I have two Eizo S2433W, one of this passes the UDACT test with easy, the other one passes it for a hair.

This is the UDACT of the first monitor:
http://www.dpsoftware.org/host/monitor_1.pdf

and this is the UDACT of the second monitor:
http://www.dpsoftware.org/host/monitor_2.pdf

As you can see, one has a good grey tones of 96.7% with a black level of 0.10cd/m2 (monitor #2)
and the other monitor has a not that good grey tones of 94.4% with a black level of 0.11cd/m2 (monitor #1).

Calibration was done using iColor with WCG PVA Matrix correction and DTP94,
6500K, gamma 2.2, black level 0.0cd/m2.

The irritating thing is that when loading LUT with a LUT loader with QuatoColorCalibrator with monitor #2 I can see barely no difference,
with monitor #1 instead I can see big difference in grey tones, images became more black.

Is it normal that two identical monitors have such a huge difference?