I believe the engine ECU, lock ECU are the same, most of the dash components, front & rear axles are the same too. I am sure there are others that I am missing - I just had a conversation with someone about this yesterday as I am in search of a donor 95 RRC to park behind my barn and was considering a 95 D1 as well.
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'95 RRC LWB, '05 Suburban Z71 (not stock), '94 F350 (only the cab shell & rear bumper is original), '62 International 404 tractor (red & white) & many other project cars in the past!
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