Parts interchange ?'s

[Skirkpat]

1)I am stripping parts for my Suburban and was wondering if a 3/4 ton 4 wheel drive mastercylinder and brake booster would work on my 1/2 ton 2 wheel drive Suburban? both are 1969's

2)I have discs on the 4x4 truck, can I use the proportioning valve if I put discs on the Suburban?

3)Would the power steering boxes inerchange?

Thanks for any help I can Get....I really appreciate it...I would love to get this thing mobile before spring.