Imperial-69 brake component’s Budd vs. Kelsey-Hayes

Maybe stupid question but, when changing from 4 piston Budd brakes to Kelsey-Hayes type one piston brakes, are the other parts still same? Budd System has tee part with brake warning switch ( looks like very similar with B body) and Kelsey-Hayes made metering valve, that's it no other parts. BTW, is this metering valve same as B and E body? Muscle car research LLC have repair kits for these, any experience about company/parts?
Thanks in advance,
Mika

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