I have copies that are unique colours for Purple / Lilac / Dark Blue & Light blue. They are all visibly different.
If they came out now they would be classed as 4 different colours.
The question I don’t know and I don’t think anyone could answer is the lilac a second run of purple and the same with blue.
I doubt when they did second presses at SST in the 80’s they matched pantones. So it’s a coin toss if these are intentionally different or someone just mixed the wax slightly different.
Discogs is helpful but I have at least 10 dino 7″ that are not on there…