E BODY DISC BRAKES....WHAT'S THE DIFFERENCE?

I've got a disc brake set up I believe is from a '72 'Cuda, but not sure. I'd like to put them on a '70 power drum 'Cuda. What's the diference between the early ('70) disc set ups and the later ones. When was the change? Do the parts interchange, early to late set ups? What parts can be used (if any) on the drum set up that's on there now? I know proportioning valves need changed, I'm just looking for the things at the axle to take off and replace.

'70-'72 used one style, '73-'74 used another.

Rebuild parts are more expensive for the earlier set up.

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'70-'72 used one style, '73-'74 used another.

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How do I tell the difference? Part numbers? I just know the dust shields are like the later ones. Didn't '70 & '71 use the same shields? So '72 used the early brakes with the later shields? I sure wish I knew what I have!