It could be as simple as the manufacturer ran out of wires from one spool and switched to a new spool that had a slightly different tinted insulation. Or maybe the color signifies that those wires are powered by a separate 12v rail then the others. Power the supply on and use a meter to see what the wires read.
You don't have to use all the wires as just a couple of wires are enough to carry everything the average printer would need. If there are plenty of other 12v wires available, just use them and don't worry about the oddly colored ones.
You don't have to use all the wires as just a couple of wires are enough to carry everything the average printer would need. If there are plenty of other 12v wires available, just use them and don't worry about the oddly colored ones.