72 C10 OEM, Classic Update Harness Questions

[BuffDrinkLots]

Hey all,
So, when I purchased my 72, the owner had a new in the box Classic update kit from American Autowire. I know the truck runs, it just has the dash harness taken out. My question is this, if I were to purchase the original factory harness from AAW instead of of messing with the Update install, can the other harnesses from the Classic Update harness be "mixed and matched" to go with the factory dash harness? Such as the Dome light harness, Front and rear light harness, etc. Seems a waste to not use the classic update stuff, I just have no "need" for it. No power windows, a/c etc. I don't have the time right now to crimp up the update harness. What would you all do? Also, it seems like the classic update turn signal/column connector looks very different than the factory, as there is no half-moon style connector in the kit. Thought that was odd.
Thank you. This site has helped so much with my build. I m grateful.