1973 Duster wiring harness compatibility question

Well... the harness (actually, "harnesses" - fronts and rear) looked better than mine but certainly not perfect. That said, for $15 it ended up being a pretty good deal. I'm going to go through and replace the various cracked and dried out wires and my connector, which is, in fact, melted!

One more question: is there a simple way to pull individual wires out of the plastic connectors without breaking one or the other?