No, all the lookup tables to is translate a given input to a given output. They are three tables of numbers, with 8-bit inputs and 12-bit outputs. So it says "when you get a value of X for red, drive the subpixel with a value of Y."
Most monitors have them, it is how you adjust colour, contrast, and so on on them, the NECs are just able to be calibrated with their tools. Also the NEC's are higher bit, so they don't cause banding or colour loss.
However they are consistent in their operation on an input. So they operate the same on it, no matter what is feeding the signal, unless you change it.
The question isn't one of what the monitor is doing, the question is if given the same input in software from the two different cards, is that then passed along to the monitor unchanged? The best way to test that would be to record the DVI signal, but I don't have anything that can do DVI or HDMI in at 4:4:4, best I have does 4:2:2 which means it sub-samples colours making it worthless for a test.
Next best thing I could do was to measure the actual colour output. If the same input on both cards generates the same output on the display, then it is quite a reasonable assumption that it was the same signal being sent.
If anyone wants to buy me a Blackmagic DeckLink HD Extreme or an AJA Io XT, plus a stupidly fast SSD, I'll be happy to use them to do a direct signal capture
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