Headlight wire harness

[MiLo]

So ive had this problem with my passenger headlight blinking whenever I hit a bump, I figured out that it wasnt the bulb or the socket or even the headlight itself, it was the harness that was loose and a prong wasnt making full contact. So I went to the junk yard and picked up a couple just to make sure at least one works properly. I did notice that the wires are different, one had 2 blue wires 1 pink and 1 orange, the other had 2 orange wires 1 pink and 1 blue. Which one do I use? And is there any difference on the wires to begin with? Now I just need to connect it. What would be the best way? Solder and shrink tubing, or use butt connectors and crimp?