PLYMOUTH IS DODGE, DODGE IS CHRYSLER, FARGO and DESOTO

I can not find one reason why in Australia the following cars were produced and sold as they were?



 Spotted anything strange yet?



1965

 All of these cars were sold in the USA as Plymouth Fury models!



1968

 In Australia they were Dodge Phoenix! 



1966



 1969



 1971



 1970



 1971



Looks like only 4 door sedans and hardtops, no 2 doors 

Why didn't they just use the Dodge