I have been experimenting with the histogram-matching script by agriggio and the colour tone.
In the example below I have loaded the raw image, set the Profile to neutral, and loaded the pp3 file with the tone curve produced by the histogram-matching script. This produced a very good luminance match to the camera jpeg, but the skin tones were reddish and a bit over saturated.
I always set my Nikon D7000 to the the neutral picture setting (as opposed to Portrait or Vivid ect.)
So I tried setting the RT Color management Input Profile to “Nikon D7000 camera Neutral.dcp” and turned Look-up table on, Tone Curve off. The only other setting change is the Lens Distortion profile is set to auto.
This produced a very close color match. Previously I have not found the Nikon sourced .dcp files useful, however with the correct luminance curve, they seem add the required color corrective. The image on the left is the camera jpeg embedded in the raw file displayed using gThumb, on Ubuntu Linux.
Here is an example-
