The easiest way to ascertain those answers is to check out the Interchange pages, such as Interchange/
Brake Interchange on the menu above. And there, for instance, you'll see that 1984 through '86 boosters interchange for all F250's over 8500 GVW. And since both yours should be over 8500 GVW you'll see that the boosters will interchange.
Anyway, you can do that with several other things in the Interchange pages. But you can then go to the Cooling System/
Radiator or Cooling System/
Radiator Support pages, but I will save you time there - they don't interchange. However, the diesel radiator supports are in short supply, so....
Beyond that, it is easier to say what
won't interchange. Here's my understanding:
Transmissions: The bolt pattern is different
Engine wiring: This is the harness that plugs into the main harness. But all of the harnesses are probably the same - although the fuel system wiring may be different. Hmmmm....
Emissions stuff
Exhaust pipes
Gary, AKA "Gary fellow":
Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI