I can verify the 73-74 Dart/69 Barracuda hood swap...did it.
How about BigBlock "umbrella" valve seals for windsheild wiper post gaskets on 66-70 B bodies....
Or A-100 seats in Superstockers?...
Or 70 Charger Hoods and fenders on Daytonas, as well as 70 Coronet hoods and fenders on Superbirds?
Or, the door glass on a 68-70 Coronet/Belvedere also fits 68-70 Chargers?
Pretty well ALL of the consoles in B and C bodies of each year are the same...
Back-up lights on a 69 Roadrunner bumper...same as 69 Charger rear valance...(?)
Almost all 1969 Chryco vehicles have the same side reflectors....