The first two links have nothing to do with the Greek texts.
The question is not 'Are the KJV and the NKJV identical.' They are not. The question is do they use the same Greek texts. They do.
That is why it confuses me why those holding to KJVO would NOT regard the NKJV as being "just' another revision of the KJV, just as 1789 revised the 1611 edition!