AU Electrical / Wiring

[ROOSTA]

Hey Guys,

I have come to you, in search of some genuine expertise..

I have some sticky questions, which may lead to stickier follow up questions..

So here goes:
Are the electrical systems in AU (Series 1, 2 & 3) falcons, fairmonts, XR's, I6's and V8, etc physically the same, just with different ancilleries, Ie, speedo, ecu, bcm, etc or are the looms entirely different?

Reason being is i have been hunting for a full V8 loom for a little while for a project.. But am starting to run out of patience, and the few that have popped up have been beyond my budget, but I am hoping to perhaps use a loom from a lower/more common model and just use the appropriate ancilleries for my project..

Any info or comments are muchly appreciated..

Cheers,
Nik