can we re-color this patches - is this doable

[denzjos]

I tried this :
Image / Mode / Indexed (value 14)
Filters / Colours / Indexed Decompose to x colors (value 14 - result is 14 layers) 
script found here :https://chiselapp.com/user/saulgoode/repository/script-fu/wiki?name=sg-indexed-decompose
Image / Mode / RGB
Recolor 1 layer at a time with : Colours / Hue-Saturation (use Hue slider)