key question

60s MoPar (at least '64!) had a 4 sided igntion key and round trunk key. Are these really the same blanks so an original initions switch could be copied on a trunk key blank -- or is there some the different about them?

Also I forget since I haven't had a 64 Dart in 38 years (and it isn't even here yet)

Was the round key for doors also, or the angle sided key for that ?