Razed (NVE mod author) usually includes a screenshot that you can compare (like from a certain location, in a certain weather, at an exact time etc). You can then go to that location & set weather & time to same , take screenshot facing the same direction & compare to see if everything is the same.
NVE is behind a paywall, so I don't know if he's still doing that^, but have a look for it in the download. Also, there should be a pretty detailed read me, make sure you've read that as with older versions of Razed's mods (NVR etc). It was required to set the in-game brightness to 50% & do a little Contrast tweaking on your monitor etc to get the right look.