For the 30c unwatermarked I find three color varieties. The most common is this one, which I find in various shades. This is the first NGR printing of 1945, and is the most common printing for this value.
These two NGR color varieties I find used in 1947/48, and are not as common.
These are the colors for the NOP thick paper printing:
And this one, a thinner unwatermarked paper, I currently call NOP, but it could be a third unwatermarked paper.
Here is a side-by-side comparison of these stamps: